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Agreed, good call....

That's a tach drive...that is standard on both motors. Look, the 6.2 And 6.5 are almost if not identical. The 1990 and above 6.2 was a better motor IMHO, the redesigned heads, injectors and pump made it smoother running. like I said, the 6.2 is embossed on the engine block, front right. Here is...

94 has the 6.5, the 87 could have either, but the 6.2 has "6.2D' embossed on the right front of the block below the cyl head. Another way to tell is if you have a crank position sensor hole on the left side of the timing cover, where the harmonic balancer is. And there are a few other ways...but...