This Interchange is for Second Gen Trucks.
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G63B and the 4G63 are completely compatible between the 1st generation and 2nd generation trucks. There is though, one non-compatible item to be aware of if trading either of these motors in a truck or car. Determine if your vehicle is a wide block or a narrow block engine. Finding out early which yours is can save a lot of time later if not checked.
To determine if your vehicle's motor is either of the two blocks, measure between the farthest points in the transmission studs as shown above.
It will be as follows: 12.5 inches = Narrow, 13.25 inches = Wide.
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