Intake manifold gasket replaced - what other items should be checked/replaced? on 2000 Chevrolet Express 1500

2000 - chevy 1500 express van 8cyl - what items should be checked/replaced when replacing the gaskets on the intake manifold for this vehicle. and how much extra should it cost and how many hours labor would be reasonable to charge for a entire job like this? I was charged $1500 total, with parts and 12hrs labor @ $65/hr and I want to make sure I wasn't ripped off? Thanks

Asked by for the 2000 Chevrolet Express 1500
1 answer 4 comments
How many miles on van? Any fuel injector work done before?
105,000 - yes we have had work on fuel injector about 1.5 yrs ago
Then gaskets should be all you need if fuel spider assem.has been replaced.Not a bad price pretty big job on a van.
12 hrs labor seems excessive as far as I can tell from some local research? He also seemed to charge double the retain price on most parts that he installed??!! Is that normal? I'm okay with a mechanic making a far price, but I know they get a good discount on parts.... He also increased the estimated price by $300.00 without letting me know until I picked it up! They should have called me when they realized the price was increasing! He also replaced items without my permission! Gave verbal warranty, but nothing in writing...
Yes i agree they should have called before adding that much to the price. I am just saying the total price
in todays market aint that bad. It takes a good while to do don't know about 12 hrs. though.
Do you know this guy, i mean will he stand behind his work?