If my memory serves me correctly I think that a 2" cup plug and some permatex #2 should work just fine to plug off the holes in then fan shroud. Some tin and pop rivets will take care of the back plate, and on the warm air intake hose I have used the aluminized hose and just formed it to fit back up toward the push-rod tubes like the "stove pipe" tube you mentioned. Also if you do change to a aftermarket fan shroud make sure that it has the directional vanes in it. If you remove your old shroud and look inside you will see these vanes that direct air from the fan to the cylinders and the heads,these ARE important. when I worked at one of the local V-Dub shops back in the 80's I saw a lot of these aftermarket shrouds that had no vanes in them at all. This caused overheating problems even up here in AK. Please note not all of the aftermarket shrouds were this way, but make sure you check before you buy.
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