There is a lot to change/add, TBs, ECU, tank and pump, fuel lines, injectors , crank sensor and trigger, TPS. It would be no bad thing to go with proper 3D mapped ignition too. There is a section in my engine management page on converting from carbs to injection and on converting to mapped ignition, it might be worth a read. I have converted a couple of xflows to full management and it transforms the engine. If you go to www.dvandrews.co.uk and follow the link to 'Engine management systems explanation and conversions' there is a wealth of information and the upgrade sections. Dave