Put the distributor together tonight, went with the pertronix pionts eliminator and blaster coil, assembly was pretty easy but the instructions don't say a whole lot about the rest of the ignition set up, as far as plug gap or where to set timing, i guess I really don't know if that all stays the same or not. all the 350's ive had over the years I just ran points and what ever stock plug gap and timing was, anyone have ideas as where to run timing, plug gap and a good plug to run? I've always used ac plugs and never had an issue, but I only used them because that's what I took out. The 455 had ac R46S plugs in it

 

Keep plug gap the same, you're not really upping the voltage, you're just getting more efficient spark timing.
Run you're timing where the engine likes it best, depends on cam ,carb, compression.
On my 455 with a bigger cam and 10.25:1 compression I have to run r43 plugs as anything hotter , would cause detonation. Also the S denotes a extended tip on the plug which can also lead to detonation

 

I agree. You have eliminated the job of maintaining the points but likely not increased the secondary voltage significantly compared to a well running point system. Treat the rest of the ignition system as before. An HEI probably would have raised secondary voltage requiring replacement of the spark plug wires. It would also be able to handle a larger spark plug gap.

 

The motor is a stock 1974, the only changers are a 70 4bbl intake and w z manifolds

 

It's a points replacement, use all the factory settings.