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Worked with a number of things and got the vacuum up to about 13 in hg. I have the Park/Neutral engine speed sent to around 750rpm. It drops quite a bit when in gear. Played with the idle mix screws a bunch. Seems to run really nice. Thanks for the help.
dropping a lot in gear means your distributor is starting to advance the timing below your 750RPM idle. put it in gear, idle drops, which pulls timing, which drops the idle further. you need to recurve your distributor with a slightly stiffer spring so your mechanical advance doesn't start advancing until ~900 RPM....
also, I'd run that cam with about 14-16 degrees initial advance and ~38 total. you may need to reduce the amount of mechanical advance in your distributor to get the 22-24 degrees of mechanical advance. you do that by welding up the slots in the advance place. if you weld to the inside of the slots, that'll increase the spring preload, which will raise the start RPM of your mechanical advance
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