For years, the 22 cu incher had puddle drains that dumped raw fuel near the lower seal. That raw fuel went directly into the lake. But the motors ran great. Then in 1968 the puddle drains were re-routed to dump into the hot exhaust stream, via a hollow bolt in the lower bypass cover. That was supposed to burn or evaporate some of the drainage to keep it out of the lake. It sort of worked. Then in 1971 the drains were re-routed again to a fitting in the upper bypass cover and into the upper cylinder for burning. The immediate result was complaints from customers that traded their old motor in for a new one. The new one didn’t idle worth a hoot in comparison. The drainage made the upper cylinder run rich. Adjust the mixture leaner and the lower cylinder would lean sneeze. Meanwhile, while all this was happening, some of the crankcase drillings and passages were eliminated which increased the puddle effect, also making the motors run worse.
It appears you are draining your new powerhead through the 1968-69 hollow bolt. That is about as good as you are going to get it. It will still suffer from puddling because of the lack of crankcase drainage, which you probably will notice if you troll a lot..
Don’t worry about the powerhead oiling. That will not be affected.
Remember when cars also ran crappy during that era due to “smog controls”?
