Hei help!!!!

:mumum: so yesterday I went to go to work and the car wouldn't start. spent 20min trying to get it to work until I noticed there was nothing under my cap and wires. I don't know what kind of pos would do this. well after all day calling parts stores I finally found one with a distributor. The thing is its an HEI conversion. It is the big cap kind and barely fit in. Then I couldn't get the rottor to line up to number one. So I found top dead center then rotated my firing order. Now it starts and runs but there is still a small miss. I cant figure it out. Timing is set at 12 advanced idling at 700 rpms. this is a 91 360 in my 72 duster. I gaped my plugs at .45. Any ideas im chevy dumb.:banghead:

also do I hook up vacuum advance or is it mechanical it didn't say anything in directions.