Ahh - the old "while I'm in there" temptation...

Mine - stock stroke but biggish cam, headers, MSD, ported heads - made 540 @ 6,000 and was going up from there.
It'd blow off its Radial T/As (295/50R15) until 3rd gear ('68 RR, 4-speed, 4.10s), but M&H DOTs helped.
If you just drive the car, and it doesn't need a crank or re-configuring and the other decisions that come with that, it's still the most awesome American engine ever.
But if you want a religious experience, and have a wide-open place to enjoy it, step it up.