Is this reasonable... $238 for a new tensioner and fuel filter

So first of all I should mention that I do trust my mechanic, just wanted to get your opinion on if I am being overcharged...

I had my tensioner & pulley replaced at my local mechanic when I bought my 93 Mustang 2.3L 2 years ago ($100) since the pulley was getting warn down, and last year the replacement part went bad- it was from carquest and ours went out of business this month...

It has been shredding Serpentine belts like crazy (5/year last one only lasted 8 days ) because apparently the tensioner is bent...

I wanted him to have him replace it again and he said that since the company was out of business he wouldn't be able to use the warranty... so I said ok since I needed to get it done so he said it would run about $60-$70 for the part... (reasonable) and then I asked him change the fuel filter while he had it.

So I called today and asked if it was done and what the bill was on it... he said $238 does that seem reasonable to you? (thats about 80 more than I had figured)

If you know 2.3L mustangs then you know that the engine is very small for the amount of space under the hood and it makes it a lot easier to work on. You can have the serpentine and the ac belt off in less than 30 seconds... so I would imagine it would help cut down on the labor cost.

This definitely makes me regret not just taking a couple hours and doing it myself

Thanks -- Yeah thats kinda what I was thinking is that he was rounding up hours... It sucks because I like my mechanic and I'm not sure how I should approach it...