Timing control yes/no ??

[a67]

When I did my first EFI retro-fit on an old school muscle car (in the mid '90s), it was first implemented with spark timing control only. Using stock GM EFI parts off of newer vehicles, I didn't have a fuel delivery system put together yet. And wanting to drive the car over that Summer, pulled the EFI and dropped the carb back on. It was 100% better then using a mechanical distributor. The following Winter the fuel delivery system was installed for EFI. Getting the fueling correct is easy, the real gains are in the control of the spark advance. EFI without spark control just isn't worth the effort. Bob. P.S. lets see if the formatting works on this post. Seems that there is an issue with this site removing the white-space formatting and running everything together...