With my raceprep I idled one tank and went easy for a couple tanks... then let er rip. After 2 gallons I still cant turn it over by hand in the car

I just picked up a 2039 to try, as well a a dyn 053. Seems most are using the 053 but watched a couple run with 2035's and figured the 2039 would be similar but smoother down low. You should be fine either way, its probably a pretty small difference.