Ive got a 4c turbo, it got a Lancia engine, mounting the engine to the gearbox is as simple as it can be, the Delta has the same engine
I think the width of the wheels are the same on the 164 and the delta, the delta is like 6cm less wide than the 164, and the delta have the wheels more outside the car. (sorry for my poor way of describing stuff in English :p )
Bay the way, i need to build a new engine, just found out that the engine block has a 10cm hole in it, thats way the engine started burning...