906 or 452 which is best overall

Hello everybody,
Great information on the comparison of these different casting number heads. My brother and I bought a 1978 440 out of a Chrysler new Yorker. We haven't disassembled it yet but I'm assuming it has the 452 heads. What I'm trying to find out is how many CC's the combustion chambers are? I have checked multiple websites and seen I think 4 different numbers, 81.5 , 88, 90 and 92. We don't have the tools to measure them. Does anyone know how many CC's the 452 combustion chambers are? And if they are all the same? Also, the engine is supposedly low miles so my plan was to check the valve stems for carbon buildup to see how tight the guides are. If they still look pretty good we were going to do a mild port and polish, hand lap the valve seats and install the new springs. Aren't the 452 heads better for the unleaded fuel because of the hardened seats? What's the largest valves the 452 or 906 heads will accept? And would it be cost effective to buy the largest stainless steel valves, have a 3 angle job done and mill them to achieve the desired 11/1 compression ratio?

We are planning on building a street/strip Dart (hopefully mid to high 11's or better) I really want to build a hydraulic roller, 11/1 with EZ-1 Indy cylinder heads but I'm not sure our budget is going to allow it. So I'm trying to come up with a plan B.

Thanks in advance for any information! I hope that everyone has a great day!