915's or 587's

The only way to know is to cc your heads and block if the piston doesn't come out of the block. Then you can make an educated decision. i will always have 2.02 intake valves any day over 1.88. Exhaust is really a wash at 1.60. If doing a valve job you can jump the exhaust to 1.65. In cc the heads you can also see how close all 8 cylinders are. Or if you need to machine the head to get the desired compression. May need valve guides. Also you can check how much lift the heads can support. One other thing 360 motors are externally balanced motors. So if you are not going to balance rotating assembly, you are stuck with putting weights on the torque converter. These are things you need to check to answer your questions. Oh yeah lots of main caps are stamped with cylinder #. However that doesn't mean they were installed that way.