Why would we think that for example, my motor's head gaskets are marginally more robust than they need to be to survive?

Maybe they are on par with any other head gasket.

But, maybe not. If the cost of the supercharger were less money it would be one thing but with the availability of the 3.4 which will readily accept the SC it's the best deal for sure.

I'm curious, you say "NA" and I assume you mean non applicable. What would be different between my year and say a '92 before the repair? What is different after the repair? My HG's were covered by the dealer so someone thought the motor was applicable and my truck is a pre 03/89 truck.

Frank.