I ran a Stattama t67 kit on a stock trans until around 400whp and the input shaft snapped in the middle of second. So, make sure you build a transmission.

Lots of used kits popping up, dont buy new.. thats just stupid.

Good intake manifolds:
l26 Upper
Fbody Upper
Stattama Custom Upper (Ill have a passenger side one for sale soonish)
SC Housing
SC/IC Housing