Which heads to use on my 383?

well you can always mill the heads down and lower the CCs on the chambers. i have a set of 906 heads that are cut down to 75 cc and cut for bigger valves. the valve seats just have to be replaced to enlarge the valves it not that big of a deal. check Indy they have a set of valves $150 for both the intake and the exhaust. If you are going to run these on a 383 you can build them now and have them for a later build on a bigger and better motor.