I went the Currie 3rd member route with 3:25 TSD. Couldn't be happier with it. I tach about 3K on the freeway at 70 mph and it is a lot quicker off a stop light. The whole thing with shipping and mounting kit was about $900.
Downside is that I go through back tires pretty quick. Hard to keep my foot out of it with the posi.
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'68 convert, 5.0 GT-40 Crate motor, C-4, Tri-Y headers, 3.25 rear gears
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