If you wanna go well into the 10's on motor I think you gotta change pretty much your entire combo. 406, 12:1 (or more) compression, ported Dart Pro 1 230cc's (or similar), Solid roller cam with 260'ish duration @ 050, .600+ lift, Super Victor intake, 950+cfm carb (why not a Dominator?) ...Just to give ya an idea theres a million formulas that'd work...
Saying that 3rd gen f-body suspension isnt any good is far from true... The current world record holder on drag radials (high 7's) is a 3rd gen with stock style suspension. I'd say save your cash do some smart suspension upgrades and you'll be fine on stock style suspension with a 10-11.50" wide tire. Theres no reason you couldnt put the car on the back bumper with it.
__________________
|