Ive fitted the St170 into my Mk3 Fiesta, just had to modify the engine mount as the hole pitch is different from the silvertop zetec, Also had to add another idler pulley so the water pump could turn the correct way, and have the alternator fitted to the front of the engine

Also need to modify the alternator bracket to give clearance for the water pump, and the bottom radiator hose needs modifying

Gearbox wise, I use a BC box albeit Quaife, and use twin 45 carbs and after market engine management

heres the pic of the engine with the modified engine mount, and pulley that I made



if you want to buy an engine mount already done, Simon Smail at SITECH Racing will do you one, and theres a company now doing the pulley kit, think its RACELINE, they do all the stuff for the Caterhams etc....

Hope that helps a wee bit