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First thing to do is put a straight edge over the sump and see just how out of true it is! Overtightening was and still is endemic with BW boxes and the sump suffers. It's probably better to make a gasket from some suitable thick gasket material than use an off the shelf one (i've even seen cork ones which are worse than useless) And i'd probably be using some kind of silicone sealer too. Though this IS risky, get too much in the sump and you'll block the filter.
In America, you can buy "improved" or custom cast alloy trans sumps for almost any domestic autobox, to get over the very real problem of flange warping, whether such a part is around for a BW 65, I couldn't say, but if there is, I'D buy one! I suspect not, as an autobox is not something associated with a "hot" car in the UK!
Steve
I suppose machining it flat is out of the question?