The largest bolt that will fit through the hook sleeves is one with a 5/16-inch thread, the same bolt size used for the V-8 valve covers. All of the other cylinder bolt holes take a large bolt that will not fit through the sleeve. The hooks themselves are large enough to get your hands through once they are attached to the head. I do not think that the rocker studs are tall enough to protrude past the top of the hook sleeves so that would not work. The hooks are sufficiently robust to support both a cylinder head and exhaust manifold as mentioned in the 1955 chassis manual. I guess that Pontiac felt that the manner in which the hooks are to be attached is sufficiently self-evident that they felt it was not necessary to state the obvious.
I will therefore be using the valve cover bolt holes - thanks to all for the feedback.
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