Realistic valvetrain expectations.
The 440 in my 70 Charger made 500 hp with stock pistons , .550 solid roller. home ported 906s, 6 pack and headers.
Ran 12.30s (3900#s) and idled/drove like a pussy cat.
Stroke it and get some modern heads professionally ported.
A custom roller cam , Good headers and a port matched sungle plane with a lot of carb.
VOILA !