If it's the same tunnel or similar to the '64-'72 chevelle, you basically have to raise the entire tunnel over the trans an inch. I did this twice and used another tunnel "cap" out of a different car and fully welded it. This actually helped the loose carpet from ACC fit a bit better. If you've got a rubber mat, no clue.
I have a Jerico roadrace trans used in Michael Wallace' car in the Watkins Glen course. IIRC, it's a 2.78 first gear 4 speed. I ran it in my '55 chevy for maybe 1000 miles. It's a beast, and I had to learn the tricks of adapting it to street use. It also saw several 1/4 miles bouts, dropping the full metallic clutch at 7000. It's virtually perfect inside and sitting, waiting for a future project. Had no idea Jerico was under new ownership. Makes me a bit concerned of ever needing parts. The heim joiint linkage would likely need a bit of messaging on the left side tunnel.
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