I agree with pmjoreland, even though you could go with printed dimensions - I'd have a little patience. Wait for the 700r4 tranny you'll use to mark where the crossmember needs to be.
Just some additional feedback, I used the original 350 crossmember but did not use the center holes into the transmission mount. I drilled two new holes in the center, an inch and a half back, so that the lip of the crossmember does not interfere with removing pan bolts. So where my crossmember sits, I have a straight shot to all bolts. If I used the original mount hole locations to the tranny mount, it'd be a pain to remove the pan.
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