 TO-30... thats probably a Z-129 engine with some crud on the number to make it look like 124.
Cracked blocks are real common on Ferguson's - engine probably frozen at some point in the last 50 years. Not the end of the world in a lot of cases. I just did a search at the top of the page for "cracked block", got over 200 hits. You should do the search, read all the comments, then decide what's best for you.
If the cracks are only at the top, I have heard guys that just re-sleeve, install the head, and run block sealer through the engine. Heard other guys drill holes through the cracked rib and run a bolt through it to hold it, other guys have it welded... special welding for cast iron. Then there is me... I drilled'em, bolted'em, then built-up the ribs with as much JB weld as I could, about 4 good layers, then ground down just enough of the epoxy to let the new sleeves pass through the holes. Made sure it was cured real good. Used a lot of that copper spray head gasket sealant when I installed the head, then ran block sealer thru it when I got her running. I bush hog, plow, and scrape, whetever...., so far, so good. (knock on wood!)
Oh, here is a picture of my little beastie! I rebuilt her and painted her, but was too cheap to buy those metal name plates for the hood! (don't look at the oil leak on the stearing gearbox, I'm not too happy about that!
Good luck!
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