Stroker question: 440 vs 400 vs 383

I've got a 70 Challenger RT that currently has a non original 383 and a 727. I've got it back on the road and overall it runs decent. At some point I'd like to put a stroker in it, with a goal of about 450-500 hp. So not looking to push the boundaries at all, just want a decent driver, not too much maintenance and easy to work on.

Are there any inherent advantages with any of these starting points? The car has power brakes and steering, which I'd like to keep. Are plugs easier to get to...

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Author: Andrew_r/t