I'm starting to collect parts for a N/A BBC 496 build for my 21'"daycruiser. This is a family ski/cruise deal, so reliability is important. I'm planning on all forged parts in the short block, ARP hardware etc. C/R around 10-1. Pump gas only. Max rpm 6000 rpm. Probably cruise at 4000 rpm. I'm shooting for lots of torque +600lbs and hp in the high 500s. I was originally thinking of going with AFR 310/315 rectangular port heads with the cnc chamber option. I plan on a roller cam around [email protected] duration cam with lift that will have a stable profile. (hopefully hyd), Air-Gap dual plane and 850/950 carb. I'm now wondering if it might be better to use a set of larger oval ports rather than the rec. ports to preserve the mid range. I don't want this to be a PIG at the mid range just to get bigger numbers at the top end. Any thoughts on this? Any one else have a combo that has worked out real good?