kitten w/ feline asthma

i posted this in alt.cats before i saw this group which is probably more
appropriate. sorry in advance for the cross post...

we are in the process of adopting a kitten that was picked up as a stray
with his three other brothers. we were told that they were in pretty bad
shape when the shelter got them. among being pumped full of antibiotics
all four had serious eye infections to the point that the one kitten lost an
eye (he has been adopted by his foster parent).

we are a tad bit concerned because the kitten we want to adopt has a slight
wheezing sound when he breathes & purrs. according to the adoption counselor
he has always sounded like that. the kittens are to be neutered tomorrow at
which point they are going to find out if he has a cold or has some other
respriratory "thing" such as asthma (which the adoption counselor
mentioned). i've looked on the internet at what would make a cat
continuously wheeze and i doubt it is something infectious since his
brothers are fine. if it it asthma could anyone tell me what sort of costs
im looking at down the road? anyone he seems healthy otherwise and i
actually didn't notice the wheezing, my partner did. he does have an
extremely small & pointed face (sort of reminds me of an alien head!) thanks
for your time!