Nils, Usually stalling after hard braking is due to the floats being set too high. This can be tricky on Panteras due to the engine sitting level instead of tilted as in a conventional layout.
The manifold tilts our carburetors high in the front so I would consider adjusting the front bowl a little shallow and check for stall at braking.
Make little adjustments, 1/8 turn of the float nut and then test drive.
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