If your valve seats are good I wouldn't spend the extra money to install hardened seats. Its been discussed a considerable amount in previous posts. I realize that many guys have done the change, but many have not and been driving their trucks many miles with unleaded fuel trouble free. The alcohol that is added to the fuel now days is hard on rubber. I'd recommend changing the rubber hoses in your fuel system. You should also buy a good quality carb kit and install it. You might have to tweek the timing and work with the carb adjustments when you get it on the road.
Good Luck Don