Another thought,go carbed with a msd LS controller. I did with my 6.2. So much simpler and ignition curve and vacuum advance is very easy to map out once you get the hang of it. Runs all 8 of your ignition coils. Runs off 12 volts, cam and crank sensors. Really plug and play. Just a thought. I used an 800 cfm quadrajet, but you can use any.