Greg,
I agree with Hoyt. I would leave it alone and eventually #5 will probably lead the pack, and if nothing else, start to use a little oil or smoke a tad. The truck is old..the engine is old.. it has to be worn. Those numbers are good for an old engine, they are to be expected. Drive it and enjoy it but I wouldn't rebuild it right now, just on those compression numbers.
That's my unprofessional two cents worth!
Stuart
