If your swapping everything over from a EP71 Turbo S donor then the conversion is pretty easy. Rear brakes are the same so (drums) so leave them, front brakes are easy to swap over (1e ones are smaller), swap the fuel tank over and the fuel lines (TURBO S tank has a swirl pot inbuilt, your stock carb one doesn't, and the fuel lines are different), you'll need to put a high pressure filter on the firewall too. Wiring wise just swap everything over (engine, chassis and dash looms. If your converting from a EP82/91 GT Turbo then the job is a bit trickier. The fuel tank wont fit and you'll have to modify the lines to fit. The rear axle wont bolt straight over (panhard runs from the opposite side for starters) and the wiring needs to be converted to work etc