Breaking Point On A 440 Block

hey guys, most of you guys have seen my AFX as well as the 512 i built in high school. well the more i learn of course the more i want to change things!

so here is the deal with where this motor currently is! i have a early 70's RV block with stock caps/ ARP studs, block was fully blue printed. for the rotating assembly i have a 440 source 512 kit (4.250 stroke/4.350 bore (.030 over)). On the top end currently are OOTB Victor heads and intake. My "Learners" cam is a comp .564 lift flat hyd cam, small for now. Only changes to be made before the motor goes in are Milidon oil pump with external oil line, some long tubes and Hilborn Stacks with EFI conversion.

Now my question is that when i grow up and do the max wedge ports, solid roller, and compression bump, this thing will make some serious power, but what can the block handle? should i just start over with an aftermarket aluminum one thats already 4 bolted of rework the good old mopar cast iron one.

Im on the fence on where to go.

Thanks!

EDIT:
Forgot Pics!!!