One word of caution when using that adapter plate. I believe the drilled and tapped holes end up with a small gap between the plate and the block. Either slip a thin washer in there, or be careful how tight you torque those bolts. I've heard tales of cracked blocks from overtightened bolts. A "SAE" flat washer is smaller diameter than a standard one, and they're available in several thicknesses.
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!