Re: Alright need help with timing/carb/vac adv
w/o getting into setting up advance curve - which can be a bit complicated, esp for a novice - I'd set the thing for total timing and see how she runs.
You'll need either a degreed balancer or a timing tape made for the diameter of your balancer.
The old original iron GM heads from the era seem to like ~36* total. So....with your degreed balancer or correctly installed timing tape, disconnect the vac advance hose from the dist and plug the hose with a golf tee or something. Set the park brake, trans in neutral or park, connect your timing light to the #1 plug wire, driver's side front, and start the motor.
Point the light at the timing pointer, paying attention only to "0" if the pointer is also degreed - operating the throttle by hand - bring the RPMs up to 3000 - 3500 and see where the timing is. If you need more to get to 36, rotate the dist CCW. If you're past 36, rotate it CW. Once happy, clamp it down and recheck. Take the RPMs a bit higher to make sure it isn't still advancing. Once you have it set for 36 total and not still advancing, let the motor idle @ about 800 and see where the timing is now. Probably somewhere between 10-16 advanced. Unless you need to mess with the advance curve, this is where you set timing from now on, at idle with VA disconnected and plugged.
It's a bit intimidating setting total timing the first time with your head in there and the motor screaming. Just be sure and keep your fingers and the timing light clear of the fan. Don't wear loose clothing that could get caught in a belt.
I'd expect that cam to have a little more that 11 @ idle, but it also depends on what the idle speed was when checking it. More idle speed = more vacuum. The lumpier the cam as well as the cheaper the vac gauge is can cause an unsteady needle on the vac gauge at idle.
Good luck - we're all counting on you.
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