There's still an option to front-mount the later model engines, since the earlier mounts were incorporated into the steel separator plate between the block and the timing cover. You can either install an earlier separator plate, or drill holes in the later one for the early mounts.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!