There is a machined pad just ahead of the passenger's side cylinder head. The 2 or 3 letter suffix at the end of the stamping will identify the original application. Virtually all the truck engines with 4-bolt main bearing caps have a "T" as the first letter of the suffix.
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!