not sure of chamber volume, but sounds to me like it might have high compression with those domes. Do you know the casting numbers on those heads, probably rect. ports being from the 427 corvette. That would've been late 60"s I believe. I really don't have a power estimate but I would throw around the numbers of at least 400 HP and 450 lbs of torque. I don't think you need a big stall but some wouldn't hurt, maybe 2500? More info is needed to really be more accurate, give more numbers and the components you're going to use. Casting numbers are great. And if the heads have been milled your compression is going to be higher.