133,was made by SEAT,it has the 903cc motor as used in the 850 van/saloon/cupe etc....looks like a cross between a 127 and a 126,i think seat used the 850 floorpan to make a hatch back car before fiat would give them the tooling for the 127.......................
so,mechanical parts would be reasonably easy i would say,body parts a bit harder,you say slow? coming from a 126 owner thats pretty rich!! LOL

the 903cc motor is very good,plus you can get the coupe parts to hot it up,and there are loads of ''abarth'' aftermarket bits for the 903 as well ...............................