It is your call but you will find the vast majority of Panteras had the original carb replaced decades ago.
There is a reason for this and that reason is the original carb is a piece of junk.
A simple 1850, 600 cfm Holley carb will make the problem go away.
The owner can demand whatever he wants but if you are dead and the car is wrecked, somehow I think that he might have second thoughts as to what to demand?
No one in their right mind wants a completely orignial Pantera except maybe Lee Iaccoca?
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