no oil pressure

This IS a sb, right? It goes CW

Pull the filter, which is the very first thing out of the pump. Use your priming tool, and if it won't prime with the filter off, the pan comes off.

Inspect in the dist. hole, is the inner plug in? There's some very good photos on here somewhere

This plug here......

and see this thread...........

http://www.forabodiesonly.com/mopar/showthread.php?t=266852



Problem areas.............

The above screw in plug may have fallen out, this goes in from behind the block, with a second plug behind it in the rear of the block. There was a member here who actually installed it in the dist. hole

There's a plug in the vert. hole between the rear main and the oil sender. You can stick a rod down there and tell if it's in place, but this will not drop all oil pressure

Interference with pump/ oil pan, might have broken / cracked pump

Interference with aftermarket (ARP) main studs and pump may have broken pump

Rear main? may have spun?