i was told 2 degree's for every 50 hp, by a builder that runs close to 800 hp of nos at Fun Ford. Oh I would wait to try the nos with the 373's, 430's might be to steep with the bottle. I just went to a PA C-4 and still have the 456's and 27" tires, i dont think ill make it more than 60% down the track with the 175 plate system before i run out of motor..lol
