Technical AV8 Motor Mount Question (CL to CL of Water pumps)

Using and a late flathead block with speedway truck pumps. When a ***embled I measured 20" from CL to CL of the pump motor mounts, now the block is gone and I need to weld them in. Does the 20" sound right? It looks to wide the biscuits barely clear the frame. Trying to get this done so need some help I am sure someone knows these dimensions.

Thanks in advance.

 

20" is correct. Your frame must be pinched a lot in the front.

 

I agree 20" center to center is correct and the biscuits just clear an unpinched frame , as you say.