360 Oil Pressure Issues

1..Try another gauge

2...Are you aware of the pitfalls of the oil gallery plugs, IE the one inside the rear of the block, and the one in the vertical passage coming up to the oil sender? You can check both without much work. Remove the dist, look down the hole, and verify the plug is INSIDE the block at the end of the gallery. The vertical one, you use a rod and measure down to it. I'll have to find the dimension.

3...Are you using the proper part number filter? There may be several that fit, but if they are not recommended for Ford/ Mopar you need to try "a correct one" 51068 Wix or equivalent "short" filter, 51515 Wix or equiv "1 quart" filter