360 Fire up trouble

It's all messed up! lol
"where's your T-port sync set at?, and what's your idle-timing?
Bigger cams need more idle air bypass, and more initial timing.Satisfy their needs!"

The long cranking time speaks to a lean condition
The long warm-up time speaks to a rich idle condition, or a faulty stat
The lack of accepting a load speaks to a lack of idle timing or a failure in the power circuit to remain off, or a mismatch of the tune,to the stall-speed.
again;
"where's your T-port sync set at?, and what's your idle-timing?
Bigger cams need more idle air bypass, and more initial timing.Satisfy their needs!

Here is a no-tools-required set-up;
Put a hose on the vacuum advance port and stick the other end on your tongue,grab the dizzy and crank advance into it until the rpm no longer rises. If the idle speed went too high, crank it down until the vacuum as felt on your tongue feels like zero,or the idle speed is acceptably low, whichever comes first.Reset your mixture screws as may be required.
Now try it.
If you still have trouble, set the T-port sync.
This is a preliminary idle timing setting only. Do not run more than 50% throttle til you get the power timing set.