the 270gmc that is the ashton came with a rochestor carb which didnt belong but worked. when i rebuilt the 270 i put on the correct zenith and sent the rochestor out to get rebuilt an was going to put that on my 51 235 on the dump since i had issues there. when the carb came back i was estatic on how the dump was going to run. i was greatly disappointed because it wouldnt run because the carb wouldnt fit the intake on the 235. i addressed that issue also but ow i have a good carb on the shelf i cant use use.