I've got one of those sandwich adapters but just decided to plumb the supply right into the block.
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I bought my 3 quart Accusump second hand but it had been rebuilt by Canton. I still need to get the remote filter assembly and electric valve.
Brian at IMM suggested these fittings. I've got the headers installed and the hose routing should well clear the primaries and I have some Heatshield Products Lava Tube to wrap around the hose for good measure.