Ran into this last year on a friends circle track (Mopar) effort. Mid season an MSD box was installed due to ingition issues---Ran the whole season with sluggish performance that did not match the expectations---Checked the timing with 3 races to go and found out it was 8 yes EIGHT degrees retarded! Of course the last 3 races were rained out so we can only speculate --coulda/woulda/shoulda. You should observe a retarded timing condition. J.Rob