How much abuse will the ZF stand?
Depends on two things: How much traction? How will it be driven?
If you run the car at Bonneville (VERY limited traction on the salt) the ZF will probably handle anything you can get in a Pantera.
Smokey burnouts at the dragstrip? Power shifting? I would guess 400-500hp will eventually break a transaxle.
If you can afford the service, then go for it!
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