a pint to a qt in 50 miles is ALOT. its either leaking from the head gasket(s) or one of the 4 water ports in each corner of the head intake surface. You mentioned the RF and a too thick of cork end rail gasket can keep those port openings especially the front ones from sealing (the rear ones are dead ended so are less prone to leak). they will appear to be sealed when going together but they ain't. I'd pull the intake again & some new intake gaskets & use "the right stuff" gasket maker on the front/rear rails (clean the surfaces well) in lieu of the cork gaskets and a LIGHT/EVEN coat around each port opening on either side of the felpro side gaskets and a close inspection of the head and intake port opening interface on both front sides (& rear too while you are in there). for the mixture ports I like permatex 99MA "high tack" spray on the gasket around the blue borders of the intake side gasket port openings (the 4 openings on each side) Holler how things turn out EDIT Tchain cover could leak also but you mentioned the FR is wet.
