I dunno if it's remfg'd but I just said f--- it and turned it down to 1.49" on a lathe in our machine shop at lunch. The larger shaft wouldn't fit in the smaller housing.
It's all back together again and (hopefully) ready to drop in. Fingers crossed that this was a 302 dizzy and not a 351. The shaft lengths looked identical; I laid them side by side before I started surgery so I'm hoping I won't have problems with oil pump shaft clearance.
I have the most custom distributor I could ever want: machined housing, bronze gear, Pertronix ignition, and the freakin' advance plate busted off the shaft when I was removing it from my old one so I hand-filed the advance curve on this one, opened it up to 20 deg from the stock 10 deg. Old-school shadetree engineering.
My old distributor literally came apart. When I opened it up, my mechanical advance was shrapnel. My carbs were shooting flames higher than the top of the car whenever I'd drop it in gear. A stock distributor does have a limited lifespan, FYI. And when they go out, they REALLY go out!
EDIT: The gears are the same OD -- they have to be, to engage the cam -- but there are two different ID's. I was of the impression that different distributors for 302/5.0/289 had varying shaft widths but I wouldn't think Ford would be so stupid as to change the size of the hole in the block between years. That's just asinine. And yet, poking around on other boards, I'm finding stories of people who have had exactly this problem.