Filling it with oil by taking off the vc's is not too big of a pain, but getting the engine to breath properly is starting to worry me. I may have to cut a hole in the back of mine for a breather. Just something for you to ponder. I already have a thread going to help me eliminate the issue. Might help you out too.
http://67-72chevytrucks.com/vboard/s...d.php?t=483096