Well I have asked about this before and I have found a cam that based on this forum and other reading I believe is a good choice.
Putting a B&M 174 on the following.Old DLI-Kit.
Estimate 6--8lbs. of boost.
The car is a 3,600lb. B-body auto,2,500-conv. {may go 4spd. later}3.55 rear headers full exhaust.
Mostly fun street,some track time,,,,Nats,CC events,etc....
383 +.030 ,452 iron heads 2.14/1.81,may go Aluminum Stage-6. Compression will be 8.5--8.8.
950HP Holley,electric pump etc....
Cam is a Crane HYD.#683801
222/234@.050-278/290adv.
.467/.494-lift,,,114-C/L. 1,800--5,600 power band.
What do you think?

For that level of boost, that cam is fine, especially if you have it already.

However, with that heavy of a car, small of cubes, low gearing, small cam, you need to run more compression like 9.5:1 or your car will be very lazy until some boost. Also, that carb is waaaaay to big for your turbo or NA application.

I would keep what you have at that boost level. I assume you have a stock crank, rods etc. The smaller cam will keep your power range in alot lower rpms and your rotating assembly will thank you for it.

that will be a fun car!
will you use a power valve in the carb?
will you change the opening point of the sec's to open sooner?
i hope your car will run high 11's but i am not sure.

You sound okay with the combo you have in mind. That carb would be real big for a n/a or blow through boosted 383, but sitting on top of a roots blower I think you would be okay. I have no experience with the 950's but I hope they will give the driveability you want. Your cam will be fine. I agree with your line of thinking, you want to gear that blower to max it out at your max crankshaft rpm. So having both done at 6k should work well. Just do your research and make sure you aren't leaving any hp on the table with your supercharger gearing. I ran a 440 with slightly more cam(226/234 on a 110LSA) with smogger 70's 7.5 compression pistons and it ran and drove fine once I had the timing and carb dialed in. Should be a strong running combo.

Might want to boost reference the power valve. The rest sounds good enough to me.

i believe in the bigger is better and the reasone for opening the sec on the carbs sooner for more hp/tq sooner.[1to1 pri/sec opening.]

that combo will work fine ,dont stress on carbie size every one fergets a 950 only flow 750-800 cfm my pro sysyems 950 flows 820 cfm