Impco model J is what I have on my 850, similar to what you describe, installed at the top of the front of the engine. I believe this one was converted too, not sure if I can tell by the serial number if it was factory or not. It has the Impco model J vaporizor, associated hoses and circuit wires, carburetor, and a 30 lb forklift tank with cradle holder typically found on forklifts, can use a 40 lb tank if needed, just hard to heave up and over the loader arms.
If you look in a ford tractor shop manual and or parts manual, you will see some information on factory LP models, believe they were offered for both 600's and 800's, they are missing the hood door, and have a tank attached, not the same as my forklift type set up, it is a factory arrangement.
A couple of years ago I rebuilt my Impco Model J vaporizor, got the parts kit from a local supplier, and got hosed for $160 for it, found the same kit on ebay for $20-$30, forget now but was slightly p%ssed about it, called the supplier and asked what gives, yeah I needed the parts and wanted to get the tractor up and running, but live and learn, I guess we all get taken once in awhile. Was real easy to rebuild and performs much better than it did, it would stall out, harder to start in cold temps like below 20 deg, still can be hard to start in the cold, but not like it was, also much better on fuel consumption think this also repaired a leak. Not much to look at, but for a working tractor, I like it, can take a spare tank with me, just plug and play, also the oil stays clean, I'll be honest, have not changed it since Aug '04, just starting to turn color now, using 15W-40 Rotella, always been one to change fluids and do maintenance, that oil just stayed super clean it seems.
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