His starter will bolt into the bellhousing, not onto the block. That's the reason for using the early parts, since the block-mounted starter will not clear the early-style bellhousing with the 3-bolt starter nose cone bolted into the bellhousing, and it's going to be needed for the rear engine mount with the crossmember under the bellhousing.
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!