OOPS! I missed that little detail! Will the "261" cam lobes fit through the smaller bearings in the early block? A good machinist with an accurate lathe and a tool post grinder wouldn't have much trouble converting that cam, since small journal new or reground cams are getting pretty scarce due to a shortage of cores to regrind.
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!