Spark plug questions

[OregonNed]

I’m looking at changing plugs in my truck. Mine has the original 327 motor with stock heads, a mild cam, Pertronix ignition and headers. I’ve been using the Accel shorty plugs with .375 reach. Since I tend to over analyze things, I have a few questions. Would it make sense to pick a model of plug with a deeper reach? Will that work with my set up? summits “will it fit filter”recommends the .375 reach, but I want to make sure I get the best performing plug size. I also wonder what the plug gap should be for my non points ignition. Pretty sure the last one were set to .035. Would a wider gap be preferred? Really appreciate the advice. Thank you.