Ive done it on a zetec before in a fiesta si. Not hard at all really. Ive used zx9r carbs as there 44mm dia, had a manifold made by someone on xrtwo.com and there about £120, management ive had both omex 200 and megajolt, omex is better. All in can be done for about £400 inc manifold made, carbs and ingnition ecu and a bike pump.

Doing it on a puma will be slightly more in depth as you have to find away to bypass the pats as im pretty sure its part of the ecu on these cars so you wont be needing it or any of the other injection bits and loom.

Bike bodies can be run on the standard ecu and injection if you build a airbox you can even use your maf. You refering to using your injectors, i guess you have been reading where people have used a st170 manifold so they block the bike injector ports off and run the st170 injectors and rail etc

this is mine all done by me and maps downloaded from the net etc