What are you intending to tow with it, I'm working on a 1970 Ford engined 4/4 at present, also thinking about a light trailer for campink kit etc. I would like to see some pictures of the tow bar arrangement, if anyone has already got one fitted.
Those old twin cam Fiat engines are good reliable units and make good power.
One of my other weaknesses is racing a small sailing dinghy. It would be great to hook up and roll u[p to the race meeting in a Mog

All-up weight is around 150/200kg so not too demanding.
I am in the process of buying a 2nd hand towbar (no car yet, but starting at the back and working forward

) Apparently it was a factory option at some point. Also, Tudors in Shropshire have produced a very upmarket trailer!
http://www.tudor-vernon.co.uk/projects.htmPhil