From personal experience, forget about turboing the Pinto... WAY too much mucking around and as fun as it has been I'm starting to wish I'd done something simpler
Of the other engines you've mentioned I'd go with the CA18DET... it's a very good motor, good parts support, revs well and they're cheap as chips because everyone rips them out to put in an SR... not to mention I don't like chain drive but that's more of a personal preference than a legitimate reason
...Having said that, I do like the idea of a Volvo powered escort

... parts would be much harder to get though, stick to the KISS rule, you'll thank yourself later
Alastair