Engine build specs

I'm ready to spend about 6k or so on motor and trans for my 68 Fastback. It's got a tired old 302 and a TMX from a truck in it now.

I want to keep it 302 block and add a T5. Hopefully I can afford 400hp, if not 300-350 is ok. It will be a weekend street machine.

From what I can tell, a roller cam 302 and a rebuild with AFR heads and moderate internals should do it.

Can anyone help me spec this thing? I've already got a 2.5" exhaust system for it, AirGap intake, Hedman shortys.

What should I be looking at for pistons, cam and heads?

Thanks
 
I'd go with the AFR165 heads if you can afford them. I have a similar build coming up, except it's a 289 instead of a 302.

AFR165 heads
Comp Cams 282s cam
KB hypereutectic flat top pistons

It'll be a real screamer, perfect for weekend cruises