Your pictures pixel out when they're enlarged just before the block casting number can be read accurately, and we'll also need the stamped (not cast) engine number from the machined pad just to the rear of the distributor to make an educated guess about the engine's original application. The "VIN" number won't be helpful at all, especially since the cab and frame are probably different year production.
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!