Reply to "dyno of 351"

Sounds like the cam, yes, with the .586 lift.

The timing events are juggled so that in effect the overlap is about 28 degrees.

That seems to be the number necessary to reduce the blow back through the carbs.

There is another way to do that if you can use the tall 5" velocity stacks? There you can use whatever overlap cam you like.

With the tall stacks the vapor cloud hovers within the stack itself, not spreading all over the engine.

With the short stacks on that particular engine application in that car and the close proximity of the stacks to the inside of the hood that was not possible.

The Weber cam was really developed so that you could use an air filter over the carbs without them getting soaked in fuel and thus removing the fire hazard.