Well Bill, I abandoned the idea. I started a different thread on the matter. Apparently even though i had the correct frame/part number, i still didn't have the correct starter because i had a hitachi and not the nippondenso. I had clearance issues between the starter and the engine block. The bolt holding the solenoid onto the starter was hitting up against the engine block. My brother who took a look at it as well said he doens't think thats the issue. He said that their maybe other clearance problems.
My bro and i ended up returning the starter because we thought that if we too it to a machine shop, it would cost us about the same to just buy one already flanged to fit this car specifically. i bought one from brit bits for 190.
check out the other thread, i think there maybe some other information on that one. I haven't done the datsun conversion myself so i wouldn't be able to answer your question.
abe