Looking for some slant six numbers stock cam and CFM
First, welcome to the camp.
If Slant Six Dan hadn't retired he'd for sure say convert to a GM HEI module with a Mopar factory electronic distributor. Search this section as this has been covered a lot. The /6 cam specs are dismal. My stock 64 cam had .375 lift.
There are a lot of people here that know far more than me but I don't think its necessary to spend big bucks on things that aren't broken. I will probably go the electronic route but for right now I'm running points with quality parts recommended by SSD. 4000 miles and everything is good. I'm convinced the biggest increase in mileage would be an OD but in the mean time my 1964 225, 3.23 rear, and 3 speed manual got 24 mpg going the 320 miles to Carlisle last year.