I get about 15 with my 261 around town with the stock 4.11 gears. I got about 20 with the 216, before it went to knockin. The Rochester could use a bit of tuning, the thing runs a bit on the rich side. When the milage drops down I know its time to reset the point gaps (I have a dual point distributor).

Paint & Body Shop moderator
A lone amateur built the Ark. A large group of professionals built the Titanic.