It looks as if Tommy and I have had the same sort of experience except that my Pinto, a '72, started out with a Weberized, etc., 2000 engine and then had a 466 SCJ installed. I, too, used a block with ports on my FE and used -12 to a remote Oberg filter and oil cooler. I didn't use a thermostatic valve, but always intended to. No problem without, it just seemed to make sense.
KS