Need info on slant six engine

I gotta call bs on that.
Bring it. A slant 225 is going to pull ~250 max CFM and thats at ~5500 so your 4bbl may not even open the secondaries. Your going to be better off with a 2bbl and the money saved can be used for something worthwhile. a stock BBD would be totally adequate and far less $$$. You can throw a 6bbl on it but it wont make it any faster, but triple weber side drafts may make it quicker but they are measured differently.