2nd picture includes 2 of the 4 inner intake manifold fasteners sets. These 3/8" studs are 16 thread on one end and 24 thread on the top end where nut attached. Here is a picture:
3rd picture is the carburetor throttle return bracket and an outer intake manifold to cylinder head bolt. This attached at left rear of engine see picture below:
Thanks! Photos are great help. Pic 2: I found out that 2 studs are still in heads, and I found a nut for one of them. Two washers more were found as well so I have all 4 pcs. I found several bolts which could be used for the corners of intake manifold. There is no space for such big washers like with studs.
In the last photo you can see the ground strap from the valve cover to the firewall that you asked about the first time