Help!!!!!

[tkeduk8r]

well lastnight i went to put my rod from the air horn to the fast idle cam back on so my choke will work properly (the tang that locks it on to the fast idle cam is worn, so it slipsout occasionally) and i had a small oil leak in the rear of my valve cover gasket, so I figured as long as i had the garage warm I would fix that too. So in order to put the rod back on the carb the airhorn must be removed so i did that (i removed the carb to do it on the work bench, much easier) and before i placed the valve cover with new gasket on (i had just had the head in for a valve job) I re- tourqued the head bolts, and turned the rocker arm nuts down 1/8 additional turn to snug everything up (I had heard some light ticking with the new lifters i installed). Put everything back together, and ran it and now i have no ticking, but a constant miss, and i cant get any more than 15-16 inches af vacuum, where b4 i had 22-24in. The vac hoses are all new and I even blocked each off to systematically check each vac circuit. My timing is right on fac spec and does NOT jump around, and i have spark to each cylinder. Tonight i pulled the airhorn off again to check the gasket for any cracks or bad spots. replaced it and i still have the missing... Could my adding 1/8 turn to the rocker arms cause that prollem???? Or retourquing the head bolts??? I thought i had adjusted teh rocekr arms correctly b4... Im puzzled out ofmy mind!!!! I fi did something stupid PLEASE tell me!!! by the way its a 250-6 with original Rochester MV carb set up, although i did add an HEI.... thanks agin,
--Mike