The heads will only support 500 to 550 hp and both motors probably max the heads out.
So they will make the same HP but the 440 will peak at 15% lower rpms.
RPM performer intake will help.

I would try shifting about 5800 will want way lower shift point than the 383

I would degree the cam in at 102 should pick up some!

That 440 should run fine on straight 93 octane! more octane will likely slow it some!