My son and I are putting a T56 six speed in his 79 Z28, with a GEN I SBC via a special flywheel. He has the external slave (push?) style bellhousing, etc. and we just can't get the transmission to fit in under the tunnel. A year or two ago we rebuilt his engine and replaced his clutch, and had a hell of a time getting the stock Super T10 out. We had to unbolt it from the bellhousing and even then, it was very difficult - clearance was super tight. This car has had frame connectors installed, and I am wondering if something as simple as worn/crushed/squished subframe bushings could be causing the engine to be sitting too high? I think a bunch of people have swapped in T56s, although maybe not with the SBC? I really can't see cutting the tunnel, that would be so dramatic and might affect the structural integrity of that area. I know people have had to cut and or elongage the shifter hole, but this of course is completely different. Thanks so much for any guidance or direction.