Use the original manifolds to keep EGR, replace all exhaust studs even if they didn't break, replace oil cooler above the filter, check all sensors to make sure they are the same connection and in the proper locations, make sure the heater hose connections are in the right spot. The oil pans might be different too.
1999 and earlier v10 heads are different than 2000-up. The change was for improved flow and increased power. It's possible the split happened mid year of 1999. The later heads were call "PI heads" PI stands for power improved, early heads are referred as NPI or non-PI. The casting number just above the front exh port will tell you what you have. NPI will have "6.8L W", PI will have 6.8L PI". Another way if you have the intake off is the comparing the intake ports and coolant passages, they are noticeable different and not interchangeable
I don't know if the motor coach followed the same dates on PI/NPI heads, so the above paragraph might be moot. Also the early V10's had a split on intake gasket design. The int ports are the same but the later gaskets have alignment tabs on the gaskets. If your heads appear the same, you might verify your gaskets match the ports and alignemt tabs have a spot to sit in.
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