[twobjshelbys]

I learned all I wanted to know about retro-fit EFI systems with my Cobra which was equipped with a Accel system that did not self learn and after much time and money found that Roush had not populated the altitude compensation table.

I do not believe gasoline formulations are a first order effect of any driveability (ie steady state) issues with carb based engines. They are "tuned" out early leaving seasonal variations which are second order effects. Yes, today's fuel can be a contributor to vapor lock and other problems but first I never had it happen and second don't consider spending all the extra money to prevent a problem that I've never experienced. I was stuck with my system and the cost to get it working. The guys that drive their cars almost every weekend on some road trip can give feedback about the necessity.

Have at it though.