Not all CJs and 4vs came with 4 bolt mains, and from what I understand it isn't unheard of for 4 bolt blocks to show up in 2V engines -- it seems Ford used whatever block was available at the time of assembly. And the Cleveland will usually only stand about .030 overbore due to excessive core shift during casting; you can go higher, but you'll have to have the block sonic checked to make sure it will take it, or the boring bar may cut through to the water jackets. And even at +.030 they can still run a little warm (mine does). The Clevelands can be kind of a mystery, mostly because of their short 4 year run, and the different animals Ford made out of it in that short 4 years. I love the Clevelands, and am finding a new appreciation for 400s. As for installing one in a Bronco, I don't see where the difficulty is; the exhaust and plumbing the lower radiator hose to the opposite side should be the biggest obstacle. You have to change oil pans, but you have to do that with a Windsor also, so that's no big deal.
Wow Mad, I thought only 70 and 71 had closed chambers, and the CJs had open chamber heads -- I guess I poo pooed that. I went to a big yard an hour or so away yesterday and found a 351C 2V someone dropped in a mid 60s Ford truck, it still had the factory correct "351 2V" air cleaner on it. Pretty sure that block would be standard bore, but the heads looked to be mis-matched, so I'm not sure if someone has been in it or not (another thing Ford did). I'd have loved to grab it up, maybe one day I will (if it doesn't have a date with the crusher first). Just for reference, what would be a fair price for a complete Clevo? It's been a while, I paid I think $125 (?) several years ago for a 74 4V from air cleaner to oil pan, but don't really know the value of any Cleveland (2V or 4V) today.