Eric, if you:
-->Avoid high EGTs
-->Don't drive with your foot to the firewall all the time
-->Change your oil and oil, air and fuel filters regularly
then it should live a long time. Provided your engine is healthy still. If it doesn't use much oil or blow much out the blowby then it's probably in good shape.
I heard the 370 injectors aren't the best choice because the spray pattern doesn't match the engine but other than making more smoke I don't know that that will cause significant long-term damage. Seems like a lot of guys run them OK but bear in mind they will smoke quite a bit more and soot up your oil faster so it'll be good to keep it changed.
I have my eye on a '96 that I'm looking to drop $9k on but the motor runs great, sounds great and doesn't have much blowby coming out of the tube at idle. It shows 350,994 on the clock.
Vaughn