Need some measurements

Alright I am building a breakin/tuning stand so I was needing the measurements from motor mount to motor mount side to side.And from the motor mounts to the rear of a bell housing,were it bolts to the tranny.I know most V8 K members are 20' across from pad to pad,But wanted a little more specifics.It will be adjustable but I wanted to get in the ballpark for adjustment holes.Any help Is welcome!(Was to dark for me to check mine...LOL:-k)