Just another thing not wanting to worry you. If you have to go down the road of drilling out and tapping. Fit the manifold back with what ever studs are left and use the hole in the manifold as a guide for the drill. use a drill the same size as the hole in the manifold to spot the stud in the head. By this I mean just start to drill sufficient to make a dimple in the stud. that way when you remove the manifold you have the centre of the stud marked out for drilling with the correct size for tapping. You should start with a small drill and work up progressively to the correct size for tapping.
Don't try and mark the centre of the stud with a punch by eye as drilling steel in an alloy head is a nightmare as the drill will wander off to the softer material.
I know all this sounds daunting if its not what your used to. Slow and steady is the thing here.
I am sure you will be fine. As you have found out, there is loads of help and advice on here.
I am sure
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