Hydralic clutch in a capri

Has anybody converted a cable clutch to hydralic in a v8 mk 1 capri. I have upgraded to a Landrover master cylinder with a 1" boar. There is no room in the engine bay to fit it. Do i have to buy another master cylinder and fit under the dash with a seperate resivoir in the engine bay?. Also what is the biggest radiator i can fit. I know a VK Holden is a popular conversion. I was talking to a bloke in Perth and he said he fitted a VK radiator in his capri amd it ran too hot when idling and low revs. He then fitted a huge radiator and runs cool all the time, bur it goes through the apron, and i don"t want to do that.  Thanks.