Were they singles or doubles on a Vee - mine were always going out of balance on the V8 rover, bugger of a job to set them up - could've been me with no patience though.Most of my cars have had SUs - and I love them. Far less trouble than other carbs I've had.
I went as far as getting 2 twinchoke webers off cortinas in a scrap yard - the usual trick of pay for 1 and 1 in your pocket lol
Then I got side tracked and never made the adapter plate to fit them on.
Still probably on a long lost 'to do' list somewhere as I haven't had the car for 15yrs and move countries too.