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A while back I used a RtR to break in a 440 on the dyno. No problems and it made several pulls at 480ish hp. Make sure you get the right coil. The MSD unit bolted to the dyno didn't like the RtR distributor.
The cheapest/easiest way to get a high output ign system is to:
[1] Leave Pertronix's dist on Pertronix's shelf.
[2] Get a GM 4 pin HEI for less than $50 & use it with any Mopar elect dist.
I had a 65 slant 6 Coronet with the Pertronix dist. I also used a better coil and aftermarket ballast resistor. After a couple of years I never had any issues. I sold it last year but I don't know how the new owner is making out.