Thoughts on early vs. late Slants.

Something to watch out for: A lot of slant six engines did not have the pilot bushing hole in the crank finish reamed to the correct size, if the engine was getting an automatic trans. The hole is drilled, but not finished. The pilot bushing will not fit these cranks. NAPA used to sell an reduced OD sized adapter bushing but these were discontinued many years ago. Therre are a couple of "fixes" if you run into this problem.
1) take a stock pilot bushing to a machine shop on have the OD turned down smaller
2) have the hole in the crank reamed to the proper size.
3) use a late model pilot bearing (if using a 1968 or newer crank) More Information for NATIONAL FC69907