original manifold and high hp?

[Lurv]

I have a 2332cc motor with CB's CNC heads on it, I'd like to use the original manifolds (or the CB's fuel injections) but with some welding and alot of porting will flow  enough for a high hp non-turbo 2332cc motor?   

[Hotrodvw]

I modified my stock end castings for my turbo application.  Here is what I did:

I cut off the inlets, ported the crap out of them, de-burred/poished them, port matched to the heads, and welded 2" OD alum. .188" wall tubing to them.