I'm I getting ripped?

["O.O." <sundog@sedona.net>]

Hi all,
I have an 86 5k that
I took to a mechanic
for a timing belt change.
he quoted me $60 for the
job and I said ok.(I took off everything but timing belt)
Now, the day after I took it
to him he said that the large
bolt would not come loose so the
price was up to $200 for the job and
again I said ok.
The car was making a strange ticking
sound *before* I took it to him and
I thought the timing may have jumped a little,
but after a new belt and adjustment, the noise is still there.
So, now he has an estimate of $200 - $250 *more*
than the $200 for the belt change to take the engine
apart and fix this ticking noise.(it sounds bad
to me, not the normal Audi tick.)
My question is, does $400 -$450 sound like an ok price
for a belt change and fixing this weird sound??

Thanks for any input!
-Obi-One