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Stock gap of .050" is fine for stock cars, but once you delve deeper into performance territory, .035" is more desirable. I picked up 3mph on my 383 from switching to .050" to .035". I am running copper NGK TR55s.
Definitely check your fuel pressure. A fuel pressure test gauge is a must-have for any LT1 owner's toolbox. Key on, engine off pressure should be around 43psi. With the engine running it should drop to around 35 or so, then slowly rise with throttle position.
You can also pull off the vacuum line off of the fuel pressure regulator to see if the regulator is still good (if fuel comes out, it's no good). If the rubber diaphram in the FPR is torn that can cause issues as well.
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