Might want to check out this link to a Langdon S10 hei instructions thread

https://www.stovebolt.com/ubbthreads/ubbthreads.php?ubb=showflat&Number=943375

When I looked at your dizzy link it did not mention which gear is on it ( there are 2 options, and yes it matters).

Chuck


Hank: 46 Chev 1/2ton shortbed
2023 Miata RF Club