I have a car that I race that has a 408, eddy heads, headers with stock electronic ignition with chrome box. I have a 780 double pumper with 3/8 line and a holley electric fuel pump on the stock tank. I run 1/8th mile, in the 7.1 at 96 area. Occasionally it will miss slightly (2 to 4 times) on the top end and loose 1 or 2 mph. The very next pass it will run good through the whole 1/8th mile. The last time it missed at the end when I let off of it it back fired as it coasted down the lane (if that is a clue to anything). Does anyone have a guess or a way to determine if my problem is gas or electrical? I am considering putting an MSD system on it but I would really hate to waste $500 and still have the miss.Any ideas? Thanks