wagon dec

Hi lads in have a ka track car at the minute it's fitted with running gear from a puma 1.7 vct it's brilliant craic on track but after doing 2 years of trackdays I have a hunger for more speed which brings me to my question has anyone here done it if so how hard is it to do,
What ecu are you running etc
I have sourced an engine,gearbox, loom and ecu from a 2005 fiesta st and I am planning on running bike throttle bodies on it, any help appreciated