What else is original? (incredible life for an I.P. by the way)
May want to consider the following parts as well:
Balancer, crank pulley, and water pump (of course the related gaskets)
This round of service should not affect IP life, however, at 250K you're on borrowed time anyway.
The down side would be about $1200.00 if you do it yourself (IP being 800 of that)
95 K2500 HD "F" JK "big" chip, JK big intercooler, high-pops, JK 4 inch exhaust, fsd cooler, Auto Meter guages, Holeset turbo from a 5.9L Cummins, fresh 18:1 eng w/new IP, no vac pump.