I did something like that to the 637ci GMC when the mechanical fuel pump went out on it.
I could not get another one because they quit making them years ago. It mounted to the top of the engine, in front of the intake manifold and the lever arm was over a foot long to reach the cam.
Made a plate to cover the hole and installed a inline electric pump next to the frame mounted fuel tank.

It has worked good since.

Don

1967 GMC 9500 Fire Ladder Truck
"The Flag Pole"
In the Stovebolt Gallery
1946 2-Ton grain truck
1946 3/4-ton pickup,
1953 1-ton pickup
1957 1-ton flatbed dually,
1954 Pontiac Straight Eight
Of all the things I've lost in my life, I miss my mind the most!