What cam should I get?

On the vacuum advance this is what I believe-if the dist. mech. advance is right, theres no need for vacuum. You need to pull the dist. and put light weight springs in with some needle nose pliers, not easy but can be done just hard to get the tiny springs on the posts. Much easier to buy a MSD dist. if you can. I found a new old stock Mopar dist on E-bay and use Accel cap & rotor-its all brass. If the motor does not ping with the quick avance great, if it does you need to use one heavy stock spring and one light spring to slow the avance down. My adavnce is all in by 2000 rpm's and there no spark knock so I just set the timing about 38 dergress at high rpm's and leave it alone.