Here's a might-have-been ...
Fiat developed the Fiat X1/9 with Twin-Cam 2litre but it never saw the light of day. Just found ONE photo from the factory. These cars wer lighter and had more power than the great Stratos and were going to replace it in world rallying.
A work colleague had built a copy of this car for stage rallying in the UK in the early 80s. It looked and sounded fantastic , was UNBEATABLE on tarmac and UNDRIVEABLE on forest
(Sorry about quality, but it's an old book - it does look better full size )
EDIT: Renamed attachment as the pic is from 73ish