the PAS on the 1.8 and 2.0 model bravo's has less assistance so it is much better and i stongly recommend you upgrade. i previously had a 1.6 and one of the things i hated most about it was the power steering (and the seats :yuck: ) but the 1.8/2.0 steering doesnt feel half as scary.
i havent actually fitted 147 seats, all i did was take measurements to determine if it is possible. i know they will fit because the measurements are practically identicle. the back seats are same size, the mounting points will most likely be out by a few inches but iirc they have the same number of bolts in roughly the same place. its not hard to modify the mounts- say a bolt needs to go into a hole that is 2 inches out, you have 2 options: 1. drill a new hole and bolt into it (thread hole and it should manage fine for rear seats) or 2. make an adapter plate with a hole and a bolt thread on it so that the original mount on the seat and car can be joined. i prefer this option, it doesnt cause any permantent damage to the car.
the front seats looked like it would be possible to remove the lower runners from the bravo and slide them onto the upper runners on the 147 seats, if that is possible they should bolt straight in as the distance between the runners was almost exactly the same on both cars. if that isnt possible then the lower runners on the 147 seats would need to be drilled to allow bolting to the bravo chassis, or alternatively weld some new mounting points. its all easily possible with a bit of thought and possibly a bit of welding. my only problem was finding a set of 147 seats that was affordable. i got quoted £350 from an alfa specialist breaker and £200 from a scrapyard in edinburgh. both overpriced and too far for me, but if i ever get the chance i'll be doing it.