Occasional Oil Pressure Light for 2-3 seconds in my 318. Should I panic?

Nobody makes new pans. You'll have to find good used. Also, WHERE is your oil pressure sending unit? Is it in the side of the block or at the oil pump?
TBH I don't know where the sender is -- I'll have to go out there and look later.

For new pans, I was looking at these.

1972 DODGE DART Summit Racing SUM-G3535 Summit Racing™ Stock Replacement Oil Pans | Summit Racing

1972 DODGE DART Trans-Dapt Performance Products 9311 Trans-Dapt Performance OEM Replacement Oil Pans | Summit Racing