This past weekend I went to the Stray Cat car show in Dewey, Ok. There was a gentleman there with a 52 1/2 ton. 261,HEI, Fentons,HEI, and dual Cater Webers on an Offy. He had both electric chokes, and vacuums connected. This is his daily driver -- and he likes the set up. I wasn't able to get into timing specs as he had many people talking to him about his ride. This is more of a FYI - do with the info as you like.
