GM carb on my 400

Classic case of it is easier to buy stuff off the shelf than to engineer and build it yourself.
Rolls-Royce used GM electronics and A/C systems and Turbo transmission back in the 70s.
Ferarri used 400 turbos on their V12 400 sports coupe. A lot of their owners have now swapped in Vette 6 speeds now.
When my brother bought a 308GT4 it was missing both air pumps and the previous owner said that the Ferarri dealer wanted $1500 each as they were a super rare item.
I picked up 2 and sent them to him so it could pass the visual part of the smog inspection.........
$10 each for Chevette air pumps at the U-Pull-It!! That is what Ferarri used originally.