master cylinder and booster

I just put it in. Bled the system Friday night. I had to pull the clutch master out of the way to get the larger booster in place...then I learned the clutch master is dead. Blown seals I suspect. I rebuilt it once. I think I'll buy a new one this time.

Yes; I run one. There are two sizes available. One is for stock calipers, the other for bigger calipers (either their kits or someone else's). The unit is based on a late 'Vette, but they do a considerable amount of work to fit it to your Pantera. There are a few things left for you to do... the booster is an inch larger so while it bolts up, it will touch the inner fender panel (necessitating a dent) and the clutch master (forcing some clearancing there). The pedal bolts on under the dash. But the lines are SAE so your OEM lines need to be cut, reflared and bent to fit. And I recommend unbolting the master cylinder and checking whether it 'pops back' from the booster. If so, you may need to insert thin spacer washers between the master and booster, or the pre-load will cause brake drag. The actuating rod may also need adjusting for length at the same time. This is pretty much std stuff for brake system re-engineering; its a pretty good system overall.