No start on rebuilt 360LA

If you set the dist up like I posted earlier, you have an intake valve(s) hung open. Check valve lash. And DID YOU set the dist. up as I posted? Otherwise "timing" is a crap shoot. And double --triple check your plug wires/ firing order..........wires go clockwise around the cap on a Mopar SB. No1 is driver side front, no2 is pass side front. Check CAREFULLY you do not have 5 and 7 switched

Yes both valve covers off, checked 1 and 6 both were as you said. 1 closed and 1 ready to fire. Set distributor to #1 +-0-15 that’s when we saw the fireballs. Plug wires are all good, correct firing order checked 69 times.