What intake flow #'s do I need for a 306?

[Jeff Chambers]

Can't divulge all my secrets Al, but its a P-headed combination with good compression and a race cam. For N/A, probably the two biggest impacts you can make are in compression and cam selection. If you're going for an off-the-shelf cam to retain street characteristics, its probably going to cost you about 30HP over a race cam. The .500" lift restriction also holds you back a little with the TFS/Edelbrock/AFR heads since they'll continue to flow at the bigger lifts. In S/W, we're limited to cast iron production heads (GT-40/GT-40P/E7TE/289/etc) and can't port them so we really try to concentrate on the entire lift band; maximizing flow at the lower lift numbers, just not peak flow. You'll also need to think about the rest of your induction system (MAF, injectors, TB, etc.) I've seen a lot of people dial back the fuel curves because they don't want the rich idle that comes with larger injectors, only to hurt themselves on the big end of the power curve. You might consider an Optimizer or a tunable EEC system like the PMS, EEC Tuner, etc.