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after a little more than a year I tried to start my 273 commando . replaced gaskets and seals tried adjusting timing all I get is backfire advanced motor to 0 deg top dead center on balancer and timing mark at 10 before. double checked wiring firing order .still backfires . any help where to...

hi I own a 1967 barracuda fastback 273 commando 904. I was wondering how often do you need to adjust the valves ? and is this a durable low maintenance motor and what is the max horse power I can expect from it? should I swap it for a 408 . thanks larry