I would suggest that you think again about pull type combines, especially as you are used to self-propelled 300s. I ran a pull type for several years, and found it to be a royal pain in the neck (literally, as I was always turning to look back at it. A mirror never works as well as looking directly). Then there was the lack of ability for the tractor to vary its speed like a self-propelled combine, so you ended up with a pain in the clutch foot too, and fumbling around for the right gear - lots of fun in hilly country. You can hear what's going on in a combine when you're in it, so you plug up a lot less than in a pull type. My recommendation is to look for a used 750 or 850 self propelled, as they can be bought quite cheaply these days. I got a 750 with flex head about 5 years ago in Ontario for $4,000 Canadian, and I've seen them go for half that. Your 300's pickup will fit it so you should be able to pick up a self propelled for not much more than a pull type. Besides, you're already familiar with the old 300. The 750 and 850 are its more mature and improved big brothers.