The Great Pumpkin - '71 Duster

CudaChris67 said
FIRE, FUEL, AIR

Sounds like fuel and air are ok, what about the fire?
from your list above it doesn't sound like you verified if the spark plugs are making spark. you can use an in-line tester or do it the old fashioned way connect a loose plug to one of the wires and see if it gets spark.

you mentioned MSD, is that a box, or a coil? verify the coil is sending juice and the spark plugs are sparking to make sure that juice is getting through the wires. sometimes custom wires or tugged on wires are the invisible culprit

best of luck, let us know how it goes

You are absolutely right, I did not verify that there was enough juice going to the plugs. Probably not the best method to verify spark but I did hold the #1 wire away from the plug while cranking and it shocked the crap out of me so I figured it was OK. I did in fact pick up an inline tester this AM after I dropped my kids off at school. Hope that sheds some light on the situation.

It's gotta be something dumb. I mean, it wants to start. Par for the course with these types of things I guess. I'll figure it out. I hope.