Id ditch the lift pump, replace it with an electric one as matter of course.
ID then setup a circulating loop with an electric pump and put the pickup and returns in the lines After the circulating pump... essentially
WVO tank - first separator (preferably near the muffler or above and behind the Tcase where it can cop some warmth)- engine bay filter (put it on the exhuast side run the supply/return line up near the exhaust too) -elec pump - heater - final filter - t piece to 6 way valve - restriction - t piece from 6 way valve - tank
depending on how you want to plumb the t pieces you may not need the restriction.
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