I did a similar thing to install the BMC out of a Gen 3 (think it was a Gen 3...) Pajero. The 2 top brake booster studs lined up with the steering column/brake booster brace holes. I cheated a little by using the Gen 3 brake booster spacer and used the bottom through holes as a drill guide and went through the firewall with a new 8mm HSS drill bit (I dummied the spacer in place with 2 x 8mm bolts and flange nuts so the spacer was held exactly where I needed it) Had to do some sketchy free hand bending of the existing solid brake lines, but it appears to have worked fine.
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