My 2 cts., if you like the performance from the engine now, and you stated you want to keep it stock, don't pad the rebuilder's pocket.
I would go for a 3 angle valve job, hardened exhaust seats, and a balance job. I would probably even purchase a new harmonic balancer. The OE one is 36 years old and the elastomer, the rubber material between the hub and rim, doesn't last forever. Granted, its probably okay, but its like buying a new oil pump, cheap insurance.
Yes, increasing the intake size does warrant some power increases, so does a healthier camshaft, bigger carburetor, alum intake, better ignition, bigger exhaust, more rear axle gear, and the list never ends.
I hope others here give there 2 cts.........
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CUBS - 2016 World Series Champions - Thank you, Joe Madden … enjoy your next chapter.