This afternoon I finally got comfortable with the location for the radiator supports, so I got them clamped in place and welded them. The two were within about 0.004 of equal measurement side to side, which I think is OK. They were dropped about 1" lower than before, and if a replacement radiator creates hassles later it can always be shimmed higher.

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If you look back at the earlier post there's a pretty significant difference between the cross member and the bottom of tank.

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Overall fit looks pretty good! I'll still do a bit of selective bending on the hood top, but it's pretty good, and a world of difference from before.
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Belt line alignment is much, much better than it was before adjustments.
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Tomorrow I'll cut out a tab & fillet brace for the rear hood latch, drill & tap the front one, and see if I can get this beast restrained.