loud 232 valve train fix! Simple!

Rotating the shaft 180 degrees works reasonably well -- if you can drill it. Might try a diamond bit intended for drilling glass. Get one long enough to go through the original hole then through the other side. You can't center punch the shaft, so the old hole will guide the bit.

It works because the shaft is never filled with oil, not even half filled. It might get close to half at the back since the engine is tilted a bit to the rear, but it wouldn't be under pressure, and that would only be when cold. There should just be a trickle of oil out the front of the shaft, a bit more from the back. I don't recall it ever being a steady stream from the front, but it's been a long time since I've messed with a shaft rocker six.

If the engine has been rebuilt recently the cam bearing might not be installed correctly and partially block the hole. Or it's possible, though not likely, that it has spun a little. More likely the oil hole in the block is just gunked up and partially blocked. The wire trick should clear it. After that you might want to try some engine oil flush. I've just added a quart of 50/50 diesel fuel and ATF to a fully warmed engine then let it idle for 5-10 minutes. Then change the oil, drain while still hot. Running a quart high won't hurt it at warm idle, just change the oil before driving as you don't want to load the engine with the thinned oil.