Holley carb jetting 101

Took my freshly rebuilt 360 down the road today for the first time... runs well, but it smokes more than it should and it idles rather rough (even rougher when I put it into drive/reverse) My first guess is that I need smaller jets for the carb. The setup:

360 block
1971 J-heads from a 340
Edelbrock air gap intake
Dual exhaust all the way through with stock 318 manifolds
Cam - Duration 262/272, Lift .420/.442 (similar to stock 340? My father bought it a few years ago and never used it...)

Carburetor is a Holley street avenger 670.

In the manual the specs say:

Primary metering jet - 65
Secondary metering jet - 68
Pump discharge nozzle - 0.031
Primary power valve - 65


Any recommendations? :dontknow: