First, you need to pick a new builder. BP is not a builder. He is just a parts reseller that knows nothing about building what you want.
You need to call Redline directly and have Cam get you the cylinders and parts you need. He would much prefer that anyway.
Cam will likely push Snipers, CPI or Shearers on that motor.
I'm not sure you can even get CPI anymore and Shearer quality isn't great.
Snipers are hard to get because Gary is a one man show.