Hey to all i have a few questions on tbi's i wanted to know how big of a difference if any in 670 cfm and 590 cfm? I also wanted to know how difficult is it to get one of those injectors pods from holley i found a few tbi units on e-bay and they were damaged and i was wondering if it would be worth lookin into? Does anyone know if a msd 6al would work on my 94 1500 p/up i have a 350 30 over with a mellings cam 420/443 center 107/117 with the heads mildly worked up? Also are the vortec heads better and would i get a difference if i put roller rockers on either head? Can i supercharge this engine? If i am too vague i can answer any questions i really need your help. Thanx in advance  

yes a MSD 6AL will work with OBD1&2 ECM's.If u contact MSD im sure they can give u the diagram to wire it in.