Exhaust manifolds

[Happy_dan]

Hi all, a couple of things I am trying to figure out. I have pulled the motor from my 68 C-20 so I can change all the seals and gaskets etc.

I noticed a crack where a stud goes into the drivers side exhaust manifold. My first question is can I get away with the crack (I don't think so and it will break eventually) or do I need to address it? Second question is can I fix it (I don't think you can weld cast) and if not, where can I get one the same as what I have? I really want to keep it stock looking.

Here is the crack:


Second part of the question is about the casting numbers. They are very hard to read. The passenger side is better than the drivers but both are hard. Do we have any experts here that can enhance the pictures to make them easier to read?

I can send high res versions if it helps. I thought if I can read the passenger side, it might help with the drivers side??

This is the drivers side that is cracked:




As always thanks for the help.

I plan on pulling the heads and having the valve seats replaces so I can use modern gas and replace the valve seals too. Looking forward to getting it back together but have to resolve this issue!