I used to make special trips to Tijuana for that Oso Negro 100 proof. It wasn't imported back then and the in-laws were living just on this side of the border from there.
I wonder why in the FSM where they list various problems and solutions, they don't mention this? They do talk about setting the distance from the top of the steering coupler to a small index hole on the steering shaft, it's supposed to be 13/16", I loosen the steering column and pull back on...
You use a 3.79 crank, a 4 inch stroke piston and a 6.250 Chevy connecting rod.
You have to turn the crank down to 2.100 rod throws to use the Chevy rods.
It’s doable.