eyeball the diminsion of where the trans bolts to the crossmember---what if any is the difference between the mount/center line of output shaft---do your best to duplicate this distance and the angle will be the same-

A rule of thumb in aviation is one degree course deviation equals one mile in 60 also works on engine angles---a one inch differance in rear mount height will be equal to one degree IF the distance from trans mount to engine mount is 60 inches---