Small block to big block trans cross member doesn't work after swap?

Syleng1 said

Sounds like your engine is too far back. Leads me to believe wrong motor mounts or installed wrong- too much set back.

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I never saw an engine in the car, it was long gone when he listed the car for sale. But I agree, I'm sure it worked for the smaller small block trans. I bet the clearance he had with the small block trans was similar to what there would be for the big block trans at the fire wall.