It's made by GM for Brazil.
Lotus designed the cyl head?
MBHD
GM used to make them. These heads are hard to get down there also.
If doing multiport injection, consider this. Because of the siamesed ports MPI will not provide equal fuel distribution. I had to divide my ports with custom made plates. This made the MPI work much better.
I also used a 5.3 throttle body. Keep us posted with your progress.
Those gears will not be noisier.