I ran some 10.00's in my 408 Duster last year and my combo was running out of steam at about the 1000 ft line. Several issues going on as I was under cammed (550 lift solid), under carbed (750), the heads were only flowing about 270cfm, and I was running pump gas. There is a 4:88 gear in the car now and a 14-32 Micky Thompson slick.
This years engine will a roller cam and app 670 lift, 850 alcohol or 1050 dominator, 40 plus more cfm, 2 points higher compression, and either race gas or alcohol.
Now for the question aimed for guys running in the 9's NA. Do you think a 4:30 gear would work better with this combo. If and when I go big block in this car I will probably install 4:30's in the dana but would like keep costs down a little right now. What gear are you guys running and if possible what are you shifting at and what is your trap RPM. Only other thing to add is the car weights 2850 and has a powerglide in it.