360 block limits

Current motor is a 1978 360 bored .030 over, eq magnum heads slightly ported, edelbrock rpm airgap slightly ported, 10.7:1 compression .
Scat cast crank and rods and srp forged pistons. Arp rod and head bolts, possibly main cap bolts too. Internally balanced.
Cam: 109 lsa
Duration @.050 239 242
Lift .562 .559
Currently makes 440 hp 490ftlbs

With proper ring gap, fuel and ignition how big of a shot would a motor like this handle? Thinking of a 100 shot. Would something like this require the water jackets to be half filled?

Also thinking of getting a 90s magnum 318 engine and putting a cam in and slight head work and hope for 375-400hp. Then mess with nitrous on that motor. Just so I don't scatter my expensive motor. Would the cast pistons in those handle significantly less?