Just to add another angle to this (no pun intended).....i have the kiesler tko 600 in my 68 b body on the street, and my goid friend runs one in his 71 E body. In both cases, we each have viabration issues at higher speeds. His being much worse than mine. Mine starts at about 75 mph and higher. I chased this around and have all new parts. I have checked bith cars, and in each case, the transmission is installed almost touching the tunnel. We cannot get the rear of the transmission any higher and this causes the trans to driveshaft angle to be less than optimal. It is pointing downward quite a bit. This is also the case in his car. Pinion angle is off and this has been causing a viabration. In order to set the rear angle equal and opposite, the rear would have to be setup pointing up like 6 degrees. We both race around the streets and that is asking for trouble with yokes and ujoints for us. So, we just live with it. The kit could have been more thoroughly engineered with proper dr shaft angles in mind. My opinion.
Maybe this is the cause of viabration he has. Have him check his trans, driveshaft, rear angles.
Your problem is you, and your friend, needed to cut the tunnel to get the engine/trans at the factory installed angle. The first time I saw a kiesler trans swap the engine was leaning so bad that the fan was maybe a 1/2 in from the radiator at the bottom and 2 plus inches at the top ... that told me all I needed to know about their no cutting install claim.
