Twin Su Hif4

Hi all, Ive planted some beautiful fresh rebuild twin hif4s on mini but have hit a wall with plumbing everything together, fuel in’s fine, been told to block on or link breathers to crank, theres no vacuum feed but ill be using a no vac dizzy, now problem is on the float breathers…, ran the engine up other day and they leaked fuel? plus i know i have to link the float breathers together and T away but where to?? Ground?? or as the MGB’s linked them to a charcoal canister? which in turn links where? Please any help or ideas thankyou