i need more grunt out of my xf van for towing and i have a complete 302and auto out of zh fairlane sitting in the corner what problems am i likely to have fitting this combo

emissions will be a big problem unless you want to run it on dedicated LPG, (or if it's an 84/85 pre-unleaded model)

also, you'll have problems with the heater hoses interfereing with the LH rocker cover