Thanks for the reply. I've been talking to them on an all aluminum 632 and they say should run 4.80's-4.90's . My car would will weigh roughly 2350 with the aluminum engine. Weighs 2475 with tall deck steel 10.2 deck 615.A friend of mine has a TRE alcohol carb on his 615 SR20 in a 2300 lb bracket car. He has hasn't had it out in good air yet but in the summer heat he went a 4.91 in bad summer air which was .03 faster than it went on gas in the same conditions. On gas he has been a 4.83 in good air. It will likely be a few slow in really good air on alcohol vs gas, a few fast in bad air and about the same in average air. I'm going to be buying the same carb this month for my 632 SR20 going in a swing arm dragster.
What DA are you considering average air or where are you located?