Thanks Tommy! Did you buy the 1050 main body from pro-form..or Quick Fuel??? I couldn't find it on the QF web site!

Quick fuel makes Proform. They have lots of combo's that are not on their website.

Jesse uses these same proform main bodies in his carbs,says their a very nice piece. the 950 main bodies have a 1.375 venturi. prosystems 1000hp has a 1.585 venturi. the bigs 950 stage 5 plus uses a 850 proform main body with 1.400 venturi. the main body works awsome on my 408 combo. i agree with the others,the proform main bodies are a nice piece. i would'nt use the annular booster in a 4150 main body. the big booster fills up the venturi and does'nt allow enough room for air to get thru.

Will the boosters need changing for e85?

no, good as is

What size boosters are in the main body? I am thinking I may try one of these main bodies as well on an E85 setup for my engine combo next season.

Jegs part# is 793-6-1050 $221.99

I run a 1050AN QF that I bought used from a MOPARTS member several years back. I called Quick Fuel and they gave me ALL the specs to set it up. I really like the carb and the service from QF. Quality piece.