727 with 3400 stall will not idle in 1st?

camshaft...initial timing...total timing....?????

This^^^^^^
My guess is initial timing way too low. Timing first then set up the carb & in that order only or you will chase your tail forever.

Answer those questions.

If you don't know the answer to either at this point, nobody can really assist you.

There are a crapload of threads on this board regarding setting initial timing threads.