the biggest question I would ask is do you want 300 or 350 rwhp? big difference in build trying to go from one to the other on a stock stroke 302. Also, are you going efi or carb?
My combo is really basic, and makes 300, maybe 310-315 at the wheels. Last time it was on the dyno it made 295/320 tq. Since, I added more compression when I had the heads milled due to a bad HG, bigger injectors (it was lean on the dyno pull), and did a maf conversion. so it should be making over 300 now, maybe 315.
To get to 350, you really will need a stroker; if you want it fairly streetable. to get there on a stock stroke, you might need to rev it high enough to have reliability problems with a late model block (6500-7K). plus a BIG cam and heads. and it might not make that much tq down low.
If you go 347, afr 185's or the bigger tfs heads, it should make 350/350 fairly easily. (well, through a manual anyway).
My combo is a 306 w dss 10:1 forged pistons, trickflow heads milled .040, crower 15511 (218/224 .503/ .522 lift cam w 1.72 scorpion rockers). T-moss ported gt40 lower w tubular upper. 24# injectors, march underdrive pullies, pro-m 75mm maf, accufab 75mm TB, moroso cold air, JBA shorties, x-pipe w no cats, and a borla exhaust.
if I were to do it again, I would have likely gone with a different cam. I tried to stay speed density and that cam was about the biggest I could go and have it work. but it was poor on fuel economy untill I switched to mass air. knowing I would have switched anyway, I would have went with like a trickflow stg 1 or 2, or a comp 274hr maybe.
and given how heavy the car is, 3550 with me in it and under a 1/4 tank of fuel; If I weren't under a time crunch to get it back running when the original motor took a dump; I would have built a 347.
Hope this helps.