Nothing wrong with a point type distributor if it's in good shape. I don't drive my cars that many miles and I bought quality parts from @halifaxhops. THe parts in my dual point are going on 3 years. I put a Pertronix in my 70 and it has been flawless for many years. THe multispark feature of...
This is B body but looks close. Exhaust Pipe Hangers 1968-70 B-Body W/O Tips, Exhaust Hangers B-Body, 107-EH228 Reproduction, NOS and Used Mopar Muscle Car Parts
No doubt smoothing the ports will help flow but at what cost per horsepower gained? Along with the extrude honing the ports will be enlarged which makes more horsepower than the smoothing but how much material can you take out of a small port. You can't take more material than the design...
That's a fairly sick 440. Just a tick over 400 horse? Low compression, a big duration cam bleeding off even more pressure. A friend built a zero deck 440 with ported 906's and a fairly mild hydraulic flat tappet cam and it dyno'd at just short of 500 horse.