1991 Camaro RS - 350 - TBI

I went and bought a timing gun to finally work on timing it correctly, when timing it I made sure it was TDC and marked it while seeing where #1 actually sparked made sure it was around TDC or Right Before TDC, it fires up, the further I put BTDC the better it runs but harder to crank and start, the closer too TDC it'll start easier but run slow.

I replaced ICM, but shortly after that I didn't realize my lower hose & thermostat was failing so it over heated ( which overheating cause the ICM to fail last time ) which is why I replaced it because I had no fire at the plugs. I have fire now but I think ICM is going bad again "Possibly" sometimes when I go to crank it I don't see fuel, most of the time I do but I'm just confused.

I also believe there could be a Vacuum leak somewhere, could someone give me correct diagram and info on for the lines that would help greatly!