trying new combination need help with set up
434ci chevy enderle injection 20-32 nozles lunati cam lift .679-.630 278-286 @50 ad 312-323 flat top pistons with about 16.0 comp
question do they like more rpm than a 23 degree
plug gap
total timing

Can't help you much on the nozzle selections.

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question do they like more rpm than a 23 degree

Only to the point of the extra airflow capacity, and at 434 cubes, you won't have to buzz it real high. With that cam I'm guessing anything over 7200 or so will be the point of diminishing return.

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plug gap

Normal Alky injection gaps... .025" minimum, .030" maximum.

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total timing

I'd start it at 28, work your way up to as much as 32 if it likes it. Depends on what chamber size you're running, and the deck clearance.