What would be a good cc chamber to run with flat top pistons? The 462 is built with the oval port heads oversized valves 10.5/1 dome speed pro pistons scat i beam rods lunati 590 lift cam and 1.6 roller rockers but when you spin it over with a ratchet it has a stiff spot in it and havent messed with it to figure it out and if i change motors i will have a flywheel issue unless i can have the balanced changed on it. just not quite sure which motor would be better in the long run