I think the answer is that it really depends... There are too many variables to know for certain. On my first second gen with a T56, behind an SBC, I didn't cut/raise the tunnel. I did pound on a few areas, but was able to make it fit. But that was also with an aftermarket subframe, so there's no combination which I can tell you for sure worked.
On this car, we cut and raised almost 2 inches.
With a different set of motor mounts, positioning the engine higher/lower and further forward or back, it could all change.
Sorry to be so non-committal, but it's just a tough question to answer unfortunately, and very combination specific.
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