how many miles does this engine have on it?
how many since the last rebuild, if it's ever had one?
it may well be time to just get an engine kit ( rings / bearings / gaskets / seals ) and just give it a refresh. the car is 45 years old, after all.
the factory rear main seal is rope, if doing a rebuild be sure and get one of the neoprene two piece gaskets. better sealing ( when properly installed ) and less drag than rope.
if, somehow, this noise is coming from inside the convertor then this would be an excellent time to try to find a 200r4 transmission to swap in. that will give you both a shorter 1st gear ( better launches ) as well as overdrive ( taller top gear ) for lower cruising rpm and better fuel mileage.
The way to crush the bourgeoisie is to grind them between the millstones of taxation and inflation.
Vladimir Lenin
Government schooling is about "the perfect organization of the hive."
H.H. Goddard, Human Efficiency (1920)
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