Don - Enjoy your supper!
I think you're thinking of the 6030. Built from 1972 to 1977 and they only built 4028 total, 800 per year, or about four per day. They built 45 with a non-turbo 531 cid diesel making barely 130 HP then added the turbo plus intercooler and got them up to 176 hp, which still made them a big clumsy underpowered tractor, but at least a few people bought them. With today's tractor pulling rules, they use them in tractor pulling where you run component tractors, basically nothing has to be from the brand or model of tractor the pulling tractor is claimed to be.
The prior model to the 6030 was the 5020 which was rated 130 & later 140 HP, and before then, the 5010 which was only 120 hp. Only 7553 5010's were made from 1963 till 1965, and 12,909 5020's between 1965 and 1972. During the time JD was selling the big 2wd's, IH was selling 4wd's, as was Stieger and Versatile.