I just ordered a SBC427 shortblock from White Performace. The compression ratio will be 10/1 and my heads are World Products Motown220 (2.08 intake valve and 220cc runners). The cam is a hydraulic roller around a 600 lift (not sure of other specs). Initially I will have a Sportsman dual plane intake and standard 750 double pumper Holley Carb but plane to upgrade later. I was wondering how much horsepower I can expect. Fred, owner of White Performance said I should be around 600 and that's where I hope to be. I also plan to use Hedman ceramic headers with 1 3/4 primary size. Do you guys think those are sufficient? Thanks!