Plug the vacuum advance. Then check your total timing at 3000 rpm.
What happened is the mechanic left in your old vacuum advance can in the distributor.
Or the guy who re-curved it.
Probably being stock they can produce a lot of advance, maybe even up to 30 +.
So your 12 base + 30 mecahnica + 30 from the vac pod = 75 or so.
With that cam shaft you will need an adjustable vacuum pod and will have to limit the advance.
Right now, plug the advance and the check the total timing.
Drive the thing too.check for ping
That comp cam really needs a stall of 2400 or more I'd imagine.
Check their website, it's recommended and better gears too.
If you take 12 base timing and then 30 total timing you get 42, which is a bit much.
You'd have to run some heavy springs in there perhaps.
Get a good timing light...with a dial and start testing !
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69 Gto, 390 posi gears,th400 w/jim hand converter/406 pontiac/#64 HEADS/ 10:1 compression/ 190 PSI with/ TRW 160 thou domes / hooker headers 1 7/8, PRW 1.5 rockers, 405 Crower Springs, Holley 750 vac with proform upgrade, Performer RPM on points / 284 H Single Pattern Crane
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