Thank youi all who have weighed in with suggestions and offers of a suitable 
TR3/4 pipe.
I was talking to a man in UK who builds race engines and he said that his 
workshop normally remove the fuel pump and fit an electric one. Then they 
make a  pump blanking plate which incorporates a vent pipe of  two inches 
diameter.
Clearly one cannot overvent a middle aged TR engine!
Of course YMMV,
David Brister
1976 TR4A
(Rapidly becoming non original!) 
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