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Only problem is a stock 904 does not live long behind a built 360 even a modest built one.

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A 904 With stock internals will last a long time with a proper valve body installed as long as it was healthy to start with. I've built 904's out of my leftover "junk" - 6 cyl 3 disc forward and direct drums, aluminum planetary sets, etc. and had them last behind 350-400hp engines as long as a good shift kit was used, which you would probably also do to a 727. The same things that kill a 904 will kill a 727 - improper kickdown linkage or adjustment being the worst culprit. And for every cracked 904 converter hub that I've changed I've probably changed 2 broken 727 rear bands.