I did the same Ronnie, but probably about 40mm and used the original thermostat housing. Cut out the top rail at the transmission tunnel and re-welded it 40mm along the tunnel. Was going to be too expensive to fit a water rail to the engine. Was worth it though, i think it's best to have the weight of the engine and gearbox as far back as possible - the car is certainly well balanced that way.
Regards....AndyH
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