8 3/4 assembly price...is it fair??

Ive got a 742 case 3.91 gears sure grip that is dissassembled and needs clutches and spider gears. The guy who is going to rebuild it said that for 150 bucks he will reassemble the chunk (no new bearings install , (yea I know pay now or pay later...)) with all the new stuff and set the lash correctly. I will be supplying the parts, the 150 is for labor only, if I want it he would only charge 50 extra for bearing install. I thought this was very reasonable but my buddy says it is high?????????