I would still tighten up the clearance since even with the added plate the coolant can still do strange things in the void. Best thing I can say about spending the additional money on a Flowkooler is that it doesn't do any harm.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 Catalina Safari Wagon.
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