It's interesting to hear from you about your approach to things. I'm a do-it yourselfer and my Pantera has only been touched once by a professional engine builder. There is nothing on that car that hasn't been replaced or rebuilt over the years. I considered adding the third progression hole myself, with the help of U-Tube videos and advice from people like you it would have been easy. However on of the carbs had a worn bearing so one of the shafts would vibrate ever so slightly and activate the accelerator pump, dumping a bit of unneeded fuel down that tube. I could not loosen the screws on the butterfly valves without stripping them, so I decided to go new. I tried, i really did. Now I have four Webers sitting in a box and will probably still be there when I die.
My son is waiting to take over that car.
I wonder, how many Pantera owners are original owners?