Wow ! Talk about ambitious. At 15 I was drooling over a Ford Torino GT. I admire your desire. Now to business, I have absolutely ZERO idea on the legalities of one of these beasts vis a vis the U.K., E.U., or anywhere other than PA, USA and I spent quite a while digging up info before I decided to jump in. The other thing I suspect you'll find is that it might be quite difficult to even FIND either on that side of the pond. Have you considered something like an LMTV ? Parts are probably going to be another issue. Those items now out of the way, it really comes down to :
- What do you want to / can you afford to spend ?
- What unit(s) are even available ?
- Which is in the best possible condition for what you have to spend ?
- Most importantly, what is YOUR preference ?
As far as driving them there really isn't much difference in the "classic" M35 / M809 trucks. But the "classic" trucks are MUCH different to drive than the "modern" variants with auto trans, air brakes, CTIS, etc.
Whatever you decide, rule number 1 . . . Have FUN. Rule number 2 . . . Be SAFE. These are all monsters that can be your best friend or kill you in a heartbeat. Best wishes and good hunting.