"...an earlier part number for the "upper" bushing (Y Block distributors have only one) is B7A-12120-A (replaced or superseded by B8HQ-12120-A)"

B8QH 12120-A

Where did you come across B7A 12120-A being replaced by B8QH 12120-A?

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Ok wanted to back up a bit here, an earlier part number for the "upper" bushing (Y Block distributors have only one) is B7A-12120-A (replaced or superceded by B8HQ-12120-A); a search on the former also finds several on hand at a few different vendors, many of the same ones.

The dimensions are listed as: (.469" ID, .688" OD, 1.75" LONG); these numbers jibe exactly with the bushing removed from one of the cores yesterday. Whether it matters which number is ordered, or they are different as a practical matter I dunno. Looks to me though, they are just fine, plus, any supply house should have an equivalent bushing.

The distributor gear - FAE-12390-A these are all over the place in terms of dimensions with respect to the thrust surface thickness and even where the pilot holes are drilled. This is why the manual cautions (I think) they can't be swapped around. So long as the gear is not excessively worn if the dimensions are adhered to by proper placement on the shaft they "should" be able to be re-used, seems to me.

Yeah I saw the wick, I meant the cavity between the housing and bushing. Well I ordered one of the distributor shafts and a gear. In for a penny, in for a pound I guess.

good reminder, I had forgotten about Green.

Dennis Carpenter and Mustangs Etc. are supposed to have the bushings, according to Rearcounter.com Thing is, this part and other 'strib parts don't show up at their website when inputting the part #s. So what is the deal with Rearcounter anyway? How and why do they know inventory that the site in question does not? Strange.

You might also check out Green Auto Parts or Sales. They have a huge Inventory of Obsolete Parts. If it doesn't show on their inquiry site U might contact them direct and see what they have.

  

That may not be sludge, there is a wick in there. I like that bushing with the hole. My bushing seems like hardened steel ?
So many variations over the years..

Well I guess you were determined to get thing outta there /jk

Yup, there was just sludge in the cavity seemed like. Bushing did take threads like butter though, maybe it's some kind of steely oilite ??

Tbirdhq has it listed as a 57/66 bushing under 12120, think it has a hole in the side?

A lot of the time REAR COUNTER tells me some one has XXXX but when you contract them they tell me they don't..
Good luck I hope you get the bushing.
This is the one I salvaged the shaft from and then cut it up trying to figure out how that oil hole lubes a solid steel bushing, it doesn't. I'm guessing they just cast thousands of them before they changed the bushing design.