Honda Integra 1990 Problems

It's not possible to say without actually seeing a detailed quote of what the dealer proposed to do, but you could do that if you had such a quote. It's hard to justify a difference of that amount, but I would guess he would charge you a substantially higher labour rate and a higher price for the parts. Even with all of that it's hard to justify the difference, and it further underlines the need to have a detailed written quote for work to be performed and it justifies the use of independent specialists who are often factory trained anyway.