The 8v transplant is easy starting with the Punto 60 engine, you use the same ecu, gearbox, mounts etc. and just swap a couple of sensors over. The exhaust needs to be made 10mm longer or a spacer fitted between manifold and downpipe - but if you're going for a decat job avoid Janspeed as it won't fit (Trust me, I tried, cried & had to flog it) - Supersprint apparently will.
To get 90bhp, you will have to do some work - I'd suggest lightening and balancing to make it work better at high revs, ported and gasflowed head with fast road cam, Gasflowed Punto 60 throttle body (they are a little bigger bore) and a good induction kit along with your decat exhaust.
If you can do the fitting yourself, you can save a bundle. It's an ideal way to learn about how to fix cars too, just don't take any risks.
I'd guess about:
£200 for engine
£350 for full decat exhaust system
£200 for head work and cam
£200 for lightening and balancing?
£250 for remapping
Chipping is a funny business when you mod a car - the 'off the shelf' generic map used by most places for 1108's won't be best for a heavily modified 1242. You will need a one-off map doing, best to speak to Superchips or BBR to see if they can/are willing to do it.
What you could do is fit a standard 8v engine first, then develop it over a period of time to spread the cost.
It's not an accurate way of measuring, but against a stopwatch with a particularly good start I've seen just under 9 secs to 60. I've had it off the clock down a really big hill too (at 6300 revs - eeeeek!!)
It pains me to say this, but is the cost of the conversion going to be more than the value of the car? Although you would end up with something unique, at the end of the day it may be a hell of a lot easier to just buy a faster car. You may find too that with all your mods you will have to pay more to insure it than you would to cover a little GTI.
Pete.
Cinq sporting 1242cc
Cinqs&Seis Yahoo group
Clubcento
