[WILMASBOYL78]

As for valve size we are talking 2.19 Intake and 1.88 Exhaust....heads choices for stock GM are open to discussion, depending on your preference for open or closed chamber dsign and what kind of piston/compression ratio you are running. I like the 290 closed chamber head..it has very good flow potential and can help make decent compression. There is probably more power potential with open-chamber design, but your pistons have to be set up to work with the larger chambers. The 820 casting would do a good job. All of these heads benefit from some "massaging" on the exhaust side to improve flow. Use quality valve train parts and make sure you check valve to piston clearance during assembly. The oval port heads will perform better on the street and provide crisper throttle response and more low end TQ....Weiand makes an oval port dual plane manifold "Stealth" that looks a lot like a factory hi-rise and even has the choke setup....this manifold or the Edelbrock Performer RPM are good choices..add the Airgap if stock appearance is not imporatnt. Good luck..wilma