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Confusing engine specs

Hi, I bought a 1989 Formula 242 with a 7.4 "mag" bravo 1. Thing is, it seems around that year the regular 330hp 7 4l was changed internally to forged parts and other upgrades. I cannot find my exact specs which I would need if I wanted to increase hp. Since if it was the ordinary 454 just tagged "mag" but without any internal improvements I wouldn't touch it. The crank serial is 429-6612 and the engine is C447943 I found those online but not the actual specs of the engine internals ( forged or cast) thanks

Engine Serial # coming up not found

Rectangle port heads = forged internals.
Oval port heads = cast guts.

That's a cast crank.