Good post by AndyF.

Do they have Mopar flywheel, bellhousing, starter, headers, etc. And will you do the tuning, or them?
FWIW, I paid $500 basic dyno session and they did all the work (tuning, valve lash, carb & spacer swaps, etc.) In addition, I bought some carb studs and carb spacers to try from them.
They asked me to drop it off the day before so they would mount it all up, and I showed up the next morning to begin the dyno runs. I took it home that same day.
They had race gas, but I brought some 93 pump to use after initial pulls with their carb and race gas. Did back to back with my carb and both fuels.

I recommend starting with their proven carb, and swap yours after initial pulls and break-in are done.

Jim