by speedy's last dyno day read out mini A/C systems use about 3hp. which in Speedy's case is substancial.
Fuel injection genreally won't be better performance wise, but it should be much more economical. fuel, and service wise. Fuel will be poured down it's gullet efficently and the computer will be constantly deciding how much, so there is no need to tune it as such, hence the lower servicing costs.
If you want more power there are the std mods that can be done like old school mini's. Pod filter's, manifold's of course an oversize engine rebuild blah blah blah. Once these sort of mods are done though, i would guess you need to get an aftermarket computer to tune it for performance as the std one will just adjust the car back to std tune i would think. I'm not 100% sure how much can be done tune wise on the std computer. It may be worth asking the question to steve if it is something you may want to do at a later date.
-some of the differences i have seen,
- the subframes are rubber mounted.
top subby bolts are one big old bolt each side.
-Brake master cylinder and booster are one unit(this is on the later -models, not sure at which point they changed over to them)
-fuel tank is larger type and has built in fuel pump
-fuel lines are substancially bigger
-more room at the front of the motor, as there is no dissy(woohoo, no more scraped knuckles)
- there is a plastic strip that goes around the roof seam
- the flares tend to be screw on type ( not my cup of tea, but there you go)
- front seats are heavily padded so the seat position seems more constrictive. (only an issue when your my size and this is based on sitting in speedy's rover, it could just be that car?)
i'm sure there are more differences, but that's some of them.
Hope that helps
Good to see you back and now all we need is the get small bore turbo building, rotormoke dreaming guy back
Cheers
Aaron
it took me 15 mins to type all that and when i started no one had posted. I am getting old and slow.... 
