It shouldn't take much to get them running. Others have set you straight on what you have. I'll echo Ben in saying, I really like those 70's gravely engined tractors. They have full pressure engine lubrication, splash lubrication in the transmission, full flow oil filtration, an oil dipstick, and the two speed axle. With a governor they will pull a 40 inch deck, and generally they will work those rotary plows at a high idle. And you really can't beat the rotary plow for garden preparation. While a tiller will go as deep as the plow, and do an equal job breaking up the soil, the rotary plow will handle much harder ground and only requires one pass.