If your absolutely positive your going to be happy with going no quicker than 10.00 in the 1/4 at or below 135.00 MPH and no quicker than 6.39 ET in the 1/8 mile than a 5 point NHRA legal roll bar will do fine
If not happy with those numbers then have it back half with a cage at the same time your doing the coil over conversion
I built a 1971 Duster 6 cylinder three speed car into a BB street racer that I wanted to go into L.A. CA and race the black guys in Compton and Watts on the street for money, unfortunately (maybe fortunately) I ended up having to deal with a health issue before getting the car done
I had a legal chrome moly six point roll bar installed along with a coil over rear suspension using 15.5 inch extended long single adjustable Strange coil overs with 200 LB. springs , I changed them later to a set of double adjustable with 130 Lb. springs
I did not try to build it lightweight due to not wanting any one to think it might be half fast
I built a pump gas 511 C.I. 400 block stroker motor with a set of mildly ported big valve 906 iron heads that made 9.25 to 1 compression ratio, I wouldn't do that now
Buy a new set of decent aluminum heads like the Trick flow 240 or 270 heads and shoot for 10.0 to 11.0 to 1 compression ratio :thumbs
I used a low deck six pack set up on that motor along with a solid roller camshaft and a cheap set of CAT brand 1.6 ratio aluminum roller rockers that went bad right away due to using the wrong shafts
I dyno tested that motor in 2003 and it made 612 HP at 5500 RPM along with 544 Ft. Lbs. torque at 4500 RPM in Ontario, CA on a DTS engine dyno on CA 91 octane pump swill
I was hoping to make between 550 and 560 HP and didn't have any goals for torque
I got the car running in the summer of 2005 after moving up here to Oregon, I ran the car at our local 1/8 mile track in late August and then in early October I ran it at Woodburn, OR which is a 1/4 mile. It ran 7.0 in the 1/8 mile at 93.MPH, it exceeded my hopes in the 1/4 mile by running 10.69 at 124.+ MPH cork up with the air cleaner on The car weighed right at 3450 Lbs. with me in it with two 1973 Duster front bucket seats, extra thick carpet with extra padding stock heater and a decent AM/FM cassette radio.
It did have a fibreglas race weight hood with a 1968 hemi type scoop and fibreglas front bumper. I moved the motor back around 2.0 inches and I had the rear wheel wells lengthen 5.0 inches, three inches to the front and two to the rear along with full tubs to the stock inner sub frames. I also moved the rear end forward one inch I weighed it with me in it and it has right at 50.5% on the front tires with 49.5 % on the rear tires
On your deal I would build it as light as possible due to you wanting to race it at the track only
I ended up changing a bunch of parts on the car to make it go quicker and faster in the next ten years
It ran a best of 9.993 at 134.7 MPH with the air cleaner and 3.0 inch exhaust on and hook up
Duster flat rock
Good luck on your deal, build it the way you want it and have fun