Stock heads/rotating assembly, hot cam/vlave springs- how far can you go?

MRGTX said

Well after some hard thinking and teeth grinding, my plan is much less ambitious for this summer.

Edelbrock RPM Airgap with 1" spacer
Rebuild Demon 650
Recurve distribtutor
Possible: New oil pan with windage tray.
tune, tune, tune
Drive and enjoy as much as possible.

Otherwise, it will come down to taking care of the engine to keep it healthy, so I can sell it as a strong running basic motor next year and buy a stroker/aluminum head crate engine.

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If you already have the M1 dual plane intake on that engine, you'd probably be money ahead to keep that and put the money into a good camshaft and springs. You'll see more usable performance that way, and you won't lose hardly anything with that combination compared to running the existing camshaft with the RPM intake.
I am not against the RPM intake, but if the engine is changing again later, at least get a price on a camshaft selected for that combo. Several guys here recommend Oregon cam grinders.