need some advice ive got 5 door 1.25 mk5 fiesta complete with rusty arches and bent panels as a run around .

Ive also got few bit lying around like full miltex manifold decat and exhaust + puma racing inlet and option to buy a damaged 1.7 puma
Now can i bolt engine to 1.2 box and use puma loom +ecu to make a shit box sleeper to annoy civic boys
forgot to ask any other bits i might need