This from the archives and he still posts on the Case David Brown forum:
From the archives posted by DKase in 2002
Re: Z129 is Shot, Need Suggestions in reply to Chuck (CA), 04-12-2002 11:04:48 289 Ford V8 five bolt bellhousing will fit with some work. Did it to mine 8 years ago runs GREAT!!!!!
Re: Re: Re: Z129 is Shot, Need Suggestions in reply to PAUL, 04-16-2002 01:40:10 It has to be a 221, 260, or 5 bolt bellhousing 289 ford engine. The 289's 65 and newer have a 6 bolt housing and that won't work. The biggest problem I had was cooling. Mine has a belly mower under it and it is a daily user. I ended up with the hood, grill, and radiator from a 930 Case diesel before my temperature problems were completly solved. I don't have a digital camera so a picture is tough. It fits in there so nice that most people don't even notice it. Takes 2 hours and less gas to mow my 7 acre lawn than the Z120 did. To explain how I fit it in would take me an hour and several pages. I'm calving now and can't take that kind of time, but I can sure answer questions between calves. I live in SD and you're welcome to come and look. I havn't had time to paint it up so it is not real pretty,but it has potential to be a showstopper!