I second the larger exhaust valve/port idea. The intake flow on the 360 head (for a 356cc motor, anyway) is already too big. The exhaust ports are a problem even at that displacement though. If your cam decision isn't yet finalized and you have no plans to enlarge the exhaust ports, you're going to want to see some high lift numbers.
Don't want to rain on your parade but,the second pic shows a stock pre '81 KZ1000 piston.Bore size would be 70mm,factory offered oversizes in .5 steps,I never seen a 2.5 factory oversize.Aftermarket goes oversized by whole mm,ie. 71,72 etc. .You can order Wiseco pistons individually,higher dome and deeper valve reliefs.