489 Case Crush Sleeve Question

I may try that. I'm just trying to get a car on the road for next year with parts i have laying around..... knowing that it will probably need a Dana 60 in 2 to 3 years of iterative changes. It is a heavy B body wagon with a stout 440. Currently has an 8 3/4 with 7260 joint yokes. I need to have a driveshaft made for it anyway, so i was thinking of having one built with 1350 ends for the future Dana 60. It would need shortened for the 60, but at least it wouldnt be a full build when that time comes.
I had a driveshaft made by PST. 1350 on both sides. Good for 1200hp and plenty of critical speed. Bonneville carries lots of rpm for a long ways.

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