87 Toy 22R carb rebuild

Is the bolt for the harmonic balancer (pulleys) on a right or left thread? What kind of puller is needed for the fly wheel? Any bolt on after markrt parts for a few extra horse power? I might as well ask. Besides going thru the entire motor, rings, bearings etc, what else should be checked and or replaced? I would like AC on this truck, where do I look for an after market AC kit. This truck never had AC on it and I can't find it around here. The truck is to old. It has to be after market AC kit of some kind.

Thanks

GT