Okay so I feel pretty stupid, as usual, and it's
@cruiserbrett for the win. Thanks!!
The condenser does fit going in from the front and it looks like I just need to drill holes in the core support flange. I guess I should have broken out the tape measure instead of trying to make it fit. This time I cut the two triangular mounting tabs off that a PO installed and also removed the hood latch catch and support rod. So frigging obvious now.
@cruiserdan, thanks so much for the advice. I am assuming at this point that those brackets fit a different condenser because my condenser mounting tabs are wider than the core supports by a good 1/4" or so and won't fit in between on the radiator side.
Edit: Just checked the condenser part numbers for 1978 and they are the same. So I don't know.
Australia: 88460-60020
USA: 88460-60020
It looks like with the mounting flanges on the front side of the core support flange there will be about 1/4" between the radiator and the condenser.
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