Camshaft effect on fuel consumption and idle?

[dwomby]

As I have posted in previous threads, I get poor fuel consumption and a Muscle Car sounding idle. My 408 had its engine replaced with one built in 1991 that I have the following info. for. I know it used .030" oversize pistons so it must now have slightly more than 360 Cu In.

1978 Monaco 360 engine.
Mopar Performance Cam 4452761.
Mopar Performance Intake Manifold P4529116.
Piston rings 4.030"
Pistons unknown
Springs 998?

I am attaching the specs I can find comparing the cam that is fitted and the stock 1978 Monaco 360 cam.

I think swapping my cam for a stock one is just about within my abilities but, before I try it, I expect a stock cam would reduce the idle noise and lumpiness but would it also help fuel consumption to any significant degree?

I also wonder if any other type of carburetor (it has a relatively new Summit Racing Carb SUM-M08600VS. 600cfm) would help?

David