I,m hopeing some of you running a sb 400 can give me some good advice. I recently purchased a sbc 400 for my 72 nova project. It is a stock rebuilt motor. It has about 5,000 miles since rebuild then the transmission went out of the truck it was in. I plan on keeping the stock bottom end, and keeping the rpms no higher than 5,500. The cam i want needs stump pulling torque yet pull hard to 5,500. Also should i run the stock 882 heads? I have a set edelbrock rpm heads that have been ported that i bought off a member from here. They are 70cc chambers. The tech at lunati thought that i would not gain much running these heads beings i am limiting rpms to 5,500, Is he right? Thanks alot in advance.