My rear shocks look like they need to retire, was looking on Summit & looking at Calvert adjustable shocks. It's for a stock bodied E body on SS springs. Are these any good or do I need to bite the bullet & buy fome Strange units?

Maybe 🤔
Why not look at some Viking doubles ? I went from Rancho/Calvert to Viking running low 11s . Night and day

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Tex

Look at AFCO also

How far are you going to go with this ? if you plan to eventually run 9's or better with it I'd go for good shocks right now (Santhuff, Menscers etc) . I ran Calverts to 10.0's but the Menscer / Afco's are far more consistent and also D/A. I think they would be better even on a 10 sec car.
For info, the Santhuffs are easily better than the Menscers we used to run on the fronts.

The car has already run 10.5s with the current shocks, a 30 year old set of Comp Eng 3 ways, & I already have an 8 sec car. I'm just tryn to find a good quality replacement set. I run Strange coil overs on the 8 sec car & found them to be real good & have no problems buying another set. My problem is, I'm downunder so I gotta choose wisely, they're not going to be cheap by the time I get my hands on them. Do you have a link yo the ones you're talking snout?

https://www.santhuffshocks.com/shocks.html. Pretty sure I have the 2160XL's on the front.
https://www.menscermotorsports.com/ I Had these guys re-valve some Afco's, they can supply their own version if requested.
They aint cheap and I feel your pain as I'm in the UK but If I had bought Santhuffs all round in the first place, I'd be into it just as much as buying different shocks has added up to. Shop around, I got my Santhuffs cheaper than they advertised by going through an approved dealer ( https://rinehartsperformance.com/ )
As with anything custom, any info or plans about the combo you can give them will be advantageous.
Hope this helps

Many racers run many different brands of shocks. Some cars run very well with the lower cost generic stuff. Some have the best available and aren't any better. Most racers don't seem to have a great working knowledge of shock and suspension adjustment. I know we've worked very hard on it. I still feel that we could learn more. Bottom line? If the valveing is in the useable range and you know where to set it? You're going to do pretty well. Currently we run Afco and Menscer on our two cars. Both require different tune-ups, One bias with ladder bars. One radial with Cal Trac.
Doug

We were running out of extension damping (jounce ?) with the comp engineering, then the Caltrac shocks, and the original Afco's rears were pretty the same. We sent them to Menscer for re-valving to run a Radial slick and Catracs explaining what was going on. They came back much better.
We found the Menscer / Afco fronts didn't cope with the landings from big wheelies as good as the Santhuffs, the Santhuffs also responded better to fine adjustments too. Like yourself, I still think we are learning and will likely have to start again as we are changing the combo soon.

I think Santthuff and Mencers skocks are high dollar custom made drag racing shocks for all out efforts, Strange, Calverts, AFCO, Penske, Comp. engr. and several others aftermarket racing shocks are not the exact same quality as those two but all of them work well on a lot of cars
BTW, when I removed the old single adjustable Penske front coil over shocks on my Cuda and switch to a set of Afco double adjustable coil overs it took me two runs to get the car to go quicker and faster in the 60 ft. and the 1/8 mile, first run was with the factory recommended settings on both extension and compression and the second run I tighten up the extension all the way 1.27 to a 1.23 60 ft

If you are just looking to replace the shocks you have, the Calvert/Rancho shocks will be ok. If you were looking to upgrade, a reputable brand double adjustable will be the way to go. AFCO, Strange, Koni, Viking etc.

Is it a slick tyre or radial ? there is a guy in melbourne that can reco the one's you have or as you said strange and also viking work well but maybe a bit of over kill .

Just for info but they do sell off the shelf shocks too, the Santhuffs we bought are "Long, Mopar fitment" replacements. True they are pricey but you will unlikely need another shock unless you were to go to a different design of suspension. They are also rebuildable, servicable and able to be modified.
I went through buying, trying and the subsequent selling on of lots of different shocks, even the Afco "big guns" ran out of adjustment. I spent a lot of money before I spent a lot of money
Personally, after experiencing the difference, I don't think you can have "too good" of a shock absorber.

Again for info. Last pass 60ft was 1.41 on the back wheels, still tuning the combo for 3.73 gears and blowing through the converter. The 1.41 on the backs worked out as 1.34, as per the racepak (using "track time" and "G meter distance"). It has been as quick as 1.36 on the rears with 4.10's, which works out to a 1.28 60ft time, again according to the racepak. JMHO but I think that's remarkable for a 4000lb + vehicle N/A