I used to be a mechanic and my Dad was a mechanic who taught me, I still do lots of work now in a mates workshop and that has to be the most expensive quotes that I have ever seen!
 
The only way it would ever cost that much is if all the parts were 100% genuine Toyota,
 
<Start Rant>
$360 for the front engine mount? all mechanics carry press in mounts, they are $20 worth of rubber, and it takes 10 mins to remove the mount and 10 mins with a hydraulic press to remove and re-install the rubber insert and then another 10 to re-install, so what $20 for the mount and $340 for half hour labour?? 
 
I do jobs on the side and if you were in Melbourne I would do the whole lot for half that price, dodgy pricks.
</End Rant>

Yeah if that is the going rate for mechanical work these days I'm going to quit my job and start a mechanic apprenticeship :)

sorry what mechanics have 20 dollar engine mounts on the shelf for all cars? none that i know of.
 
There are a few things that may not be right about that quote but gee you should see some that i write at work...
 
If the mechanic does not know all the little quirks with these cars the quote will always be slightly off, give them some slack they may just be miss-informed. Very easy for forum people who know the cars inside out to pass judgement but this is the internet not the real world of retail.
 
I suggest getting your own parts such as people have suggested and take said items to whomever you feel comfortable with for fitment. Get pre quoted so there are no hidden costs and you should be ok.
 
With regards to the fuel tank issue, i would remove the entire thing and have it cleaned out properly with a new pump. If you don't all your new filters and pump will block up with crap that may come loose in the future wrecking your newly purchased parts.
 
You bought the car cheap and as someone said it needs work, so don't go Jewish on it and you will have a nicely running car.
 
 

No one was starting a argument, just stating my opinion as were you. 
 
Back on topic:- O P have you shopped around to get the work done yet or looked into getting the parts at a better price?
 
 

send me the car and it will be a lot cheaper. fly down and drive back. i get lots of jobs like this. everything you need is in stock