the minimum would be to put a fuelmeiser kit through the carby... if the car was dual fuel and mainly used on gas then you would end up with issues in the long run by using the carby as is...

I bought a carby rebuilt from MLP carbies in melboure.... they did a cracker of a job.... rebuilt my carby for $200... a fuelmiser carby kit is about $80 from any auto parts store

cheers
Al