This page has photos regarding the re-power of Ben's Prevost. This is how it came to us except the motor was on the trailer. 'THIS PICTURE' is the left side motor mount. Air mounted motor mount. Motor mount with gusset, not too strong. There needs to be some steel to mount to.
This shows the front of the engine mount. Mounting pad with tubing crossmember, left side. Right side. 1/2" plate motor mount. Main frame extension. This looks strong enough.