With mine, I bolted the unit up to the A833, then put a jack under the Gv, and rammed the sucker into the tunnel 'til the suspension unloaded. Then I reshaped the tunnel from the cab side, with a bfg until it fit. Then I slotted the late-style mount about 1/4 inch, or whatever I could get, and called it done. It has never tapped the floor, probably because I have the engine chained down with a Schumacher restrainer.They said it was good for 1200 horsepower, so I figured it could take a few hammer blows. It doesn't leak up there so I guess they were right.
I had to cut my H out too, from the TTI system. I really missed the torque, and spent all summer looking for it. By next summer I had a 3.09 low in there, and that was the end of the softness. Now those 3.55s take off like they were 4.12s.And with all the torque I found last year in the fine-tuning, she's a rocket now.
I wanted to keep the 3.55s cuz that makes her a 4-gear car to 93 in the 1/8; 2 splits and 1 pull. Also it makes 65=2240 just above were my 230 cam vacuum peaks, so I thought that would give me the best shot at fuel-economy. I was wrong, that 230 has no economy in her, not with any other gear or any other carb. It's just baaaaad no matter what,lol
