thanks. but what is different about the bell housing as the renault stud pattern is the same on both engines

hi im a newbe member. iv a few questions about an engine swap on a 1.4 340. basically im a renault enthuast normally and just got a complete rotter of a 340 as a rear drive project. i already have a 1.8 16v f7p engine with a ecu and throttle bodies ready to go and want to know what i need to fit it ...