I have a 258ci w/ an Offenhauser 4bbl intake and an Edelbrock 500cfm Performer 4bbl. The 500cfm is a tad much but can be jetted down to run awesome w/ the 258ci. Holley makes a 390cfm 4bbl that is the perfect size for the 258ci.
I still get a kick out of the noise the secondaries make when opening. OH yea no where close to being emissions legal. I get that shocked/ disgusted look from hybrid owners when they smell my rich exhaust.... <img src="/forums/images/graemlins/evil.gif" alt="" />