Here's the TRF/factory numbers:
(2) 113122 gasket, manifold to head
(1) 106958 gasket, exhaust manifold to head pipe
I usually find it possible to leave the carbs attached to the intake manifold (both manifolds must be removed together). But if they have to come off, you'll need
(4) 112867
Usually, the insulators can be reused. But if not,
(2) 112866
As long as you're ordering, might as well get the new studs. Sounds like 2 of the 3 are already ruined, and I'm guessing the third one is in bad shape.
(3) 101442
As a side note (your mechanic probably already knows this), I find it very helpful to coat the studs with copper-based anti-seize, every time I have the nuts off. It works really well at ensuring the nuts will come off next time with a minimum of fuss. I've tried brass nuts and so on, but ordinary steel nuts plus the anti-seize work the best of anything I've tried.
PS, be sure he uses new split lockwashers on the nuts holding the manifolds to the heads. The heat seems to make them lose their spring, which lets the nuts work loose later on. I also find it helps to use a heavy flat washer (aka setup washer) on the outermost studs (the ones without the bridge pieces) in addition to the split washer.