Main jet size for a chevy 292 I6?

Anybody know the correct main jet size for a chevy 292 with a Rochester Model B carburetor? I'm sure a factory manual for a '64-'67 Chevrolet Truck would have it listed, but the manual I have is 1970 and shows the size for an M series(later) carb. The jet I have now is rich and I'm curious what the factory jet size should be.

 

Try a 58 if it doesn't already have one in it.

 

Ok that's the same response I got over on the Inliners.org forum, so I'll try a #58. Thanks for the help.

 

+2 on the 58 to start with.