hello mate, im new to this site as well, but i have done over (4) mk1/2 escort cosworth conversion's? here is a quick crack down! from the start you need a very good shell? the other is how you what to do the conversion! as you can use the floor pan etc from the 4x4 cosworth, but to me thats alot of work.... to me the easy way is useing the shell the way it is, but there a lot of body mods needed? and there is alot of parts to buy to put the cosworth in... unless you a very handy man at the job! ive got to say there is no saving money on a escort conversion! so the shell will need seam welding some people dont, but to me its a must! depends on spec of engine, you can fit 5-link set up for bome prof performance, but again some people you use leaf springs and tramp bar's? the bulk head lip is a yes! you need to shave it back the width of the head and close to the bulk head flat-out, then weld it! gearbox tunnel, best off useing the one off the 4x4 cosworth? or use a grp4! the rad sround needs mods to fit std intercooler or you buy the conversion kit all in one, then its a easy kit to fit? worldcup x-member is needed, useing worldcup pinto mounts but you need a mod sump, dont piss on with a RS2000 sump! then there's your rear alxe, again depends on wot power you got, atlas is top right up to 490HP but that has to be a motorsport set up! you can use a english as my mate duzz with a LSD unit std shaft, that run's 340bhp till now still no problems! for brakes,suspension is all need to be upgrade'd dont use std crap... it dont work.... ive tryed.... if there is any thing else let me know.... hope this helps you!