Lope???? From a mild cam??
Chrysler never did put .050" duration specs on their OEM cams, but MP's Larry Sheppard and the Race Manual state that their .050" duration is more like 80% of the advertised duration. The .050" Duration specs came about in the later 1970s, as a means of comparing aftermarket cams for their true duration rather than advertised. Although there IS a SAE-Specified method to measure camshaft duration, intake and exhaust, which relates to the initial lift from the cam's base circle and any "ramps" that might be in the lobe's profile.
When I put the old Mopar Perf electronic ignition kit on my '67 Newport 4bbl, I used a MSD 5C box on it. The old, basic street multi-spark box. Made no real difference in anything, just that I know it's there. With NGK V-Power plugs (pre-Iridium time frame).
I put 906s on in order to drop compression ratio a bit, but still some trace clatter at WOT with factory timing and 92 pump octane fuel. With a '72 Imperial y-pipe back 2.5" "sewer pipe" single exhaust system (when I could still get the pieces from Walker Exhaust).
The idle should be smooth in gear, brake on, with the a/c running full blast at "hot base idle", as it was meant to be. No exhaust rumble as similar Oldsmobiles tended to have. But not a wimpy sound, either.
With the ignition points, the dwell might be toward the small side of the spec, but the main thing is to set the points and THEN the initial timing. As the dwell changes, so does the base timing. With a distributor with some wear on the distributor lobes, getting within the specs is good, though.
Enjoy!
CBODY67