Quote:

When I retard the timing a couple of degrees the idle drops (as to be expected).
The vaccum reads 10 in. hc.
the more retarded the timing the less vaccum, correct ????



Yes you will have to increase your idle setting to compensate.
If your starting at 10 btdc I would probably drop it to 5.
Yes, less vacuum. How much vacuum do you have at 10btdc and 'normal' idle? Hopefully at least 15-16? Much less would indicate a higher duration than stock cam (in all probability, could be other things of course)