I Have a 87 iroc with 406 bored 40 over 480 lift cam stock 400 heads,327 gear,saginaw 4speed with 3.50 first gear,750 holley,headers Lt, 3 inch duel bullets air gap ,intake,haven't ran yet but im figureing low 8s i do have 125 shot of nitrous not hooked up yet though what do i need to do motor wise to get high 6s or low 7s thanks

better heads and more gear or some suspension mods and slicks.

i have SFCs LCAs 10 inch slicks but no heads any recommendations?????

My combo is very tame for streetablity, you can look at sig and gets some ideas. Put your shortblock with my valvetrain, your gonna be 6.70's no problem, even faster if your lighter than I am.