Ran into the first engineering problem of the day...
The dipstick tube assembly that routes the dipstick away from the crankshaft and toward the oil pan sump had a little glitch in translating to a block five years younger.
See if you can identify the issue:
Yes, the bracket was designed for a 1975 block that had the #3 main cap with the two mounting bosses not a 1970 block that had #2 and #4 caps with the mounting bosses for a windage tray.
