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Great question! A few for you first. What are your base rules defining stock class? (Restricted by model year, engine displacement, are aftermarket turbos allowed or only if they were factory, must have factory block, tire size, drawbar; is there a speed limit; etc.) In what weight class do you want to pull? All of these things will determine which Oliver model will be best suited to competing for you. As an example, in the stock classes in which I pull, the tractor must have stock block and engine equipment (no aftermarket turbos allowed, which is key) and rpms are held to 10% over stock rpm. Must have factory drawbars and they cannot be modified in any way. Also, no pressed steel wheel centers unless they were factory equipped. There is usually a 5mph speed limit in the classes from 12,500 lbs and below. I pull with a 1950-T in the 10,500 lb. and occasionally to 12,500 lbs. Does well at 10,500. The turboed 310 Oliver diesel coupled to the Over/Under is a real strong advantage over say a JD 4020 (no aftermarket turbos on them remember) with their Syncro-shift conglomeration. I can't make it any lighter without going to pressed steel in the rear, but can't do that with the rules and wouldn't want to anyway. I would highly recommend the Over/Under in any tractor you choose; it can mean several extra feet when used properly and shifts very smoothly, especially into Under with no power hesitation or disruption. Also pull a 2255 in heavier classes (13,500 and up). Lots of cubic inches with the 3208 even without a turbo that helps it compete; it's a lot of fun.
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