340 in a 1966 valiant, remote oil filter woes

Are you using the Canton remote or just a bolt on adapter over the OEM plate? I bet the plate gasket is leaking. The plates can bend, they can bottom out without sealing or just be wasted on the gasket side. Take it out, look at it. See if the screw flange is inline with the outside edge. If not, tap it with a hammer so it is bowed out so when you tighten it, the edges hit first. Then of course use a new gasket and scrape the old crap out. I had 2 gaskets under mine as the old one was painted and I didnt even see it. finally got it to seal: Mr Gasket with 2 Industrial 3/4 hoses attached to 2 Russel NPT 45's. for some reason I had to tighten the hoses onto the adapter before I screwed it on to the block so I was turning everything. Finally got it tight and ran the hoses up the fenderwell and tied them into the filter adapter.