It's just a bespoke two-seater that pays tribute to the Indy race cars of the 1920s. The biggest problem you have will be perfect drilling of these dowel holes with the engine in place ( we do ours with the engine stripped and stood on end in a milling machine) slightly out of perfect 90 degree with the rear of the crankcase and the bell housing will never fit properly, I hope you find that process already done or it might run into a bigger job that you would like.Before we move forward, I need to point out that this barebones vehicle has nothing to do with Cadillac beyond the engine, gearbox, and radiator. I would check out the transmission first as it will have to be removed in case it was the cause. The factory had a way of reaming these things in place with some special offset reamers, beyond my tool box I'm afraid. Off set dowels sound a great idea, wish I had used that. on the rear of the engine are two pilot holes that would have been for the domestic positions, after all, these tank crankcases are made from modified domestic engine patterns before casting, these have to be drilled out for smaller dowels than the tank had, the process I went through meant drilling the holes in the bell housing larger, then completing the process as Tom suggests, then welding a tight fitting washer over the ends of the dowels inside the bell housing. Both Tom and Jim are correct as to the jumping out of gear, The shop manuals from most cars will tell you misaligned transmissions will cause this, however, in the case of the tank engines, changing your bell housing will not be the answer as the tank has extra wide dowel positions which have to be cut of before a domestic bell housing can be fitted regardless of year, that would have already been done to yours, from then on the transmission is NOT in line.
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