Welcome
If its a Phase2 16V from 1996 then itll be Monaco Blue, which was also found on the Willy 3.
Sounds like youve got a very well priced car, but beware that rear arch. Its very cheap to cut out the rust and paint it up again, but it WILL come back unless you have a good job done. In fact, the best way to stop the rot it is to weld an entire new arch panel on! Time was when you could get 16V/Willy arches in three parts, but they now only come as one. Fortunately, the "normal" Mk1 Clio arches still come in three parts and are very cheap - the lower part will still fit in with a 16V/Willy upper.
I had a few spots of the dreaded arch rust on Willy No.123. I had a job done for £150 and though it was reasonable...until 3 weeks later some spots came back!
As for the engine, its not unknown for some F7P (16V) and F7R (Williams) engines to make more than the standard outputs with no mods. Chips, filters and exhausts make little difference in my opinion (having had all on) - but you CANNOT beat the sound of a Valver with an induction kit...even if it does rob you of power!