[Flygirl]

It seems like the five speed or 3.31/WR might be a good solution. I sort of like the authenticity of the four speed, and it's a bit cheaper and from what I understand a bit more durable than the Tremec five speed which would be the alternative.

On the other hand, the flexibility of the five speed would be nice and freeway driving would be less frenetic, and it would give some of that CR feeling...

I too have heard both sides of the Jag rear end argument and know of at least one car with a strong 427 that's seen significant track and strip time—excellent maintenance, and continuous upgrading, too—and seems to be running very reliably.