Some questions on the 273 head gasket "thing".

Blue62Val said

Head gasket - I've read all the stuff about the bore being smaller and therefore a smaller "odd" shaped gasket.

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Hey mate, have a look at the Cometic Australia page here, CHRYSLER 318/340/360 V8

They have multi layer steel head gaskets with the smaller bore for the 273. Various thicknesses as well, down to 0.027’’. Might be worth giving them a call.