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Message: <blockquote data-quote="BigTang" data-source="post: 850574" data-attributes="member: 10950">Any unpleasant things about 347's has been cleared up for at least 10 years. Better parts and better technology as long as you buy from a good source, like Probe/CHP, fordstrokers, etc.Go 347. You won't have to run 10psi to get the same level of HP as you would w/ a 306. You can get a 28 oz assembly and that will help w/ getting the 20 pounds of dead weight off the snout. If you plan to run 14 PSI buy the strongest intake you can find because the block isn't going to keep itself together w/o some help (insert LOL here)Plan on 347, good I beams(h beams if you ever intend to go to a better block) good slightly dished piston, more dish if you can mill the heads down, gets the flame on the piston and out of the chamber.If you were going aftermarket block those 3 choices shouldn't even come to mind. 363 or nothing.</blockquote>