Cool. Thanks for the explanation. I wonder if after I paid for and tuned a QFT 1450 it wouldn't have been cheaper to go the EFI? But then I don't trust computer controlled stuff. Seems nine out of ten snags with a newer car or truck is engine control box related. I'm even thinking of going back to points due to the module in the HEI. , I always carry a spare one of those just like I used to carry spare points and condenser.