Well, the only advise I can give is to trial and error. On my 46 chevy I had some aftermarket frame engine mounts. When I redid it I hung the engine in there and spaced it up until it sat where I wanted it too. Far better approach than going with predetermined mounts. If it looks like everything will clear and it sits in the frame right and you can get your angles for the driveline correct, then I would say that would be the best spot for it.