302 engine help

[geoffpowerstang]

-91 GT Block
-bored .030
-E303 Cam
-AFR 165 heads
-Crane Cams Roller Rockers
-Edelbrock Torker II intake
-Holley Street Avenger Carb 670cfm
-Accel breakerless distributor
-Holley electric 110gph fuel pump
-AOD trans w/1650 stall converter

I just installed this engine in an 89 LX Mustang which was origanally a 4 cyl. Everything has been gutted(EEC, injectors, etc.) and replaced with the simplest system possible, so I thought. Well I got the engine running at about 14 degrees BTDC, and it will idle at about 900 to 750 rpm. It is very erratic as far as the idle and the very rich smell from the carb. A freind told me to hook up a vacuum gauge to the carb at the intake and I'm reading about 12 inch hg which I think is way to low. I have replaced the intake gasket and still the same vacuum reading. I was also told you can adjust your idle mixture screws using the vac gauge by getting the highest vacuum possible, but the needle doesn't move. Also when I get the engine to idle and put it in gear it will kill the engine. I have got the car to drive and I found that when I get on the gas it bogs down once I hit second gear. But if that's due to a seperate prob then I will get to that later. I'm just trying to get the idle to smooth out now. Any help would be apprietiated.