SoCalPSD- looks good
Kansas Jet-
An easy way is with a bare block, pan, crank and driveline. I use different shims under the pan for mock-up, 1X4's & 1/2", plywood and smaller if needed for setting height, and right to left, as well as front to rear angle(s). I've also done this with a complete motor (sbc) and it worked well. I went 1/8" up (thin paneling shim) then drilled stringer brackets, and motor "settled down" when the weight was on the mounts, but this was for 4 pt. mounts, not a rail type mounts. An overkill engine hoist helps too.
Pull the logs for access/room
1.5* is what I shoot for, 1/4-3/8" out of the splines.
Daniel
Mash on it