You are describing negative camber which the car is definitely not meant to have. Having said that, a little bit is a very good idea!
First check then is to figure out why you've got the negative camber. Most likely cause is accident / corrosion / distortion damage to the base unit. Not easy to spot either. Another possible is someone having fitted V8 suspension components to a 4 cylinder or vice versa. Either way the best policy would seem to be to get loan of a simlar spec car and get the measuring stick out. (I'm assuming from what you say that all suspension rubbers have been changed)
Once you've discovered the cause, next thing to do is to get the camber equal on each side. I wouldn't be too fussy about getting the wheels vertical; like I say a bit of negative should sharpen the turn in and give you better grip when heeled over - very desirable.
Equalising the camber is almost certain to involve either component changes or some energetic exercise with a lump hammer or jack! Leaving them unequal is not an option; it will give you peculiar bump steer effects in a straight line and probably some odd tyre wear, apart from giving you different handling one side to the other.
All sounds a bit dramatic, but I hope that helps.
PS: when you find what caused the negative, let us all know, I for one would like to do the same to mine!
Chris York