Stock 273 4bbl intake question

cudamark said
That would one hell of a mounting bracket with a hole that size. Marine/commercial/industrial wouldn't have had the C.A.P. requirement that year, so, why would they use that manifold and not the non C.A.P. version? This casting was mainly a Ca. requirement. All the marine/commercial/industrial stuff that I've seen were only 2bbl engines and I haven't seen any of those with that casting add-on.....as Cuda Al's 2bbl C.A.P. photo shows.
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Check my other postings in this thread and you will see that one is marine specific. As far as the size of the bolt for a bracket I take it you have never been around farm machinery before. The equipment back then was built to last and I am still using a loader tractor from 1948.