Performance timing

dazedand confused said
MaxTax : i went out today got the motor fully warmed up and vaccum advance still plugged off and at idle in park i turned the distributor till the timing on the tape read 15º on the 0 mark on timing cover and idle is at 800 rpm . When i hook up the vaccum advance i can hear the rpm's come up and the timing reads 42º at the 0 mark on the timing cover and rpm is at 1000. Where do i go from here?

The question is why is it pulling timing at idle if you are picking up vacuum for timed vacuum? You shouldn't pull any timing when you hook the hose up to ported vacuum unless there is something else wrong. Or, you are hooking the hose up to manifold vacuum.