327 can turn some rpm due to short stroke/big bore combination. Chebby lengthened the stroke to make the 350, gettin more bottom end torque but losin the high rpm capability.
Screw in studs and decent valve springs, and a great cam would be any of the high output Z-28 grinds, Duntov 30/30 etc if you wanted that old school hot rod sound .. or you could opt for latest hi-tech hydraulic roller setups.
It's an air pump .. a 650 is 'namby-pamby' -grin- .. a 750 vacuum secondary will work fine, especially if you have someone you can talk to about settin it up (pump stroke, springs, jets, ..all the usual suspects) ..then comes initial timing, advance curve, total timing ..once they are all 'set' she will scream

And fumes burnin yer eyes .. you'd have loved standin anywhere behind my L-88 powered '64 Malibu. It idled at 2k rpm, shift point was at 7600 rpm altho I rarely pushed it that hard, wasnt many cars I had to wind it up to get ahead of

Usually short shifted at 6k into second, and if the guy I was racin was still there then I would take it to 7600 and slam 3rd. It felt like a heartbeat of time between launch, 2nd, 3rd, 4th, finish line
