from what ive read about all the plenums, spacers, lower collectors and iso thermal gaskets and what not.....i have come to the idea that maybe i could run this setup with proper tuning and and aftermarket STB

MREVlower collector + 5/16 Spacer + Crawford Plenum + Crawford STB

would this be a viable setup?
im under the suspicion that i may lose power at the top end.
i guess what im most curious about is if doing the spacer and the collector AND the plenum is overkill and useless when i can just one or 2 of the 3 and get similar agains

Insight?

 

I have the Crawford Plenum/STB on my 350 and it lightly knicks underneath the hood. If you have the spacer it will not fit, unless you cowl or fab the hood. I read somewhere that the Crawford Plenum reduces the 30% airflow loss to the front cylinders to under 5%, though I think these numbers are inflated.