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Great info. Is your 273 a Commando ie. 10.5:1 compression and dual point distributor? The factory specs on the Commando/Charger rated 235HP with solid lifters. Where do you think the HP gain came from on your engine? The OPEN headers are probably the biggest help. However, I don't think headers...

Where can one find scripture and verse on specifications, fitment, interchangibilty and cannibalization of 273/318/340 heads, blocks and exhaust manifolds/ headers??? Ex: X vs J? 273 vs 318 vs 340 exhaust ports/ header fitment? valve/cam differences? optimum...