Carl:
What kind of lift did you put your B up on? Did it support the wheels or
the chassis? If the latter, you likely missed where the exhaust system was
close to the body/chassis.
It would be best if you could put your car up on a drive-on lift. Then with
the engine running you should be able to locate exactly where the exhaust
system is shaking against the body/chassis.
I had this problem with my MGB after hitting a highway blacktop swell. It
whacked the curve of the header down-pipe just enough to cause it to sit
close enough to the under-trans cross-member to bang against it under
acceleration. Only solution was a new header down-pipe.
Norm Sippel
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