would a Holley 4160 need a rebuild after being installed on an engine with an out-of-phase distributor?

if so, what parts in particular should be looked at?

 

Hmm. Now that I've noticed the Carb board, this should probly be moved there....

 

If it backfired during this episode, the power valve may have blown out. Most later carbs have a check valve to protect it from that, though.

 

so the power valve is the only part that might have been damaged?

and yes, it did backfire several times.....

 

And if you do get a replacement power valve, try to get one with elongated slots in the fuel passage stem instead of one with the series of drilled holes. A power valve is supposed to allow more fuel flow, and the little holes don't do that as well as the slots or "windows".