I think the 3 outermost holes between the cylinders on the intake side all drain to the sump, but I'm not certain. If you haven't already dumped all 4 qts of oil on the ground, I'd just spin the aux shaft with whatever oil is left.
Here's some pics of a B21FT block, which should be similar to a B230:
I haven't seen any diagrams showing the oil paths, so I'm guessing a bit here but it looks like:
- the pump transfer tube goes up to the main filter-side oil galley between cyls 3&4
- the main galley goes to the block/rod bearings [???] and
- to the oil filter outer hole
- the oil filter return (center pipe) goes up the block to the head (teardrop relief) and
- to the pressure gauge
- the block-to-head passage goes to the cam bearings and
- drips down on the intake side to the sump
If this is correct and the oil filter relocation kit was somehow blocking oil flow, I'd expect good pressure to the block/rod bearings, but bad pressure at the gauge and at the cam bearings.