If dyno testing is part of your engine program I think preparing an extra set of carbs and distributors to keep on the shelf would be helpful for uptime.

$50 or less per carb, if i owned the carbs. :)
98%+ chance just needs Quick cleaning, new needle and seats…I keep several sets of new gaskets/parts/etc so can help myself of others and not have to wait days for parts.

If those motors have MSD distributors, take of cap/rotor and look for rusted springs/weights/etc that nay be binding/broken/etc.