Thanks so much for everyone’s input. I have not heard any good things about a Rochester. My Grandfather had a 54 GMC with the 270 (I believe) and it did have a Zenith on it. That truck ran like a Swiss watch from 66 tell the day he passed on in 2000. So I am going to go for the Zenith. Hopefully it will resolve my issue.

I found this link -
http://www.zenithfuelsystems.com/downdraft_228.htm


Take care,
Steven
No one can drive us crazy unless we give them the keys.