126 Intake Manifold Question (Rough Idle almost solved.)

[Theurig]

after changing a few parts on my 126 I kind of got rid of my rough idle, there however was still a miss every so often, (I had changed the idle control valve and that cured the lions share of the bad idle.) So after saying enough is enough, I took it to an independent German automotive mechanic few days ago ( I don't know why I didn't take it to him before.) He put the car on the scope and the electric was all over the place, after checking all the electric components, he closely looked at my cheapy ignition wires, and said big no no. So next day he put's in Brand new Bosch wires, adjust's the timing, adjust's the gas (CO; which I assume is carbon monoxide.) and the car is running much better. So in his quest to get it running perfect he does some other tests and notes the intake manifold to be having an air leak. So now here is my question, I really enjoy working on the Merc, and the $475 he quoted wasn't bad , (I think) my buddy is also quite mechanically inclined, how long will it take for us to change the intake manifold gaskets, ( I want to change both.) and what should I look out for.

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