hi all im new to passion ford really.just got myself another oldish ford.a mk2 fiesta accept its running a rs1800 and a xr2i box..i'm wanting a b&m shifter kit for it but im unsure what to buy for?a mk2 fiesta or a xr2 box??also does anyone no the serial numbers to identify a rs1800?while im at it im wanting to run r6 carbs.is there gona be much work in this?how much am i gona be looking at to fund this? thanks