Having troubles deciding which optionto go with. I have a project jeep going, Elinore64 is getting a complete make over her clothes are off and we are starting from the ground up, complete roll over frame restore and all there are pics if you would like to see. Speed bump is though, I have the 231 V6 complete not in the jeep yet but soon. T90 tranny is marrying the V6, but I recently figured out that it was going to run about 650.00 for adapter and all the works.  So I found out that the SM420 will marry up to the V6 without any adapter.  Should I get one of these instead or stay with the T90?

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The SM420 is a great idea. It will bolt to your engine using a factory Buick bellhousing. However, you'll need an adapter to mate the 420 to the Spicer 18 transfer case. Advance Adapters and Novak both have a good kit to do this.