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I am new to this Mopar thing. I have parted a few out but haven't really worked on one yet. I have a 1973 Duster I bought w a 360, X heads, Purple stick cam 474 lift , 238 dur @ .050 and MSD igintion. The car won't start up so I need to start from the beginning to make sure the didtributor is in...

Can anybody tell me what size valves came in these 1973 340 J heads? casting #'s are 3418915-F and 3418915-C Also what cc combustion chambers?

My friend bought this year ago. It has the "X" heads on it. Here is the block casting # 2780930-340-7 does it have a steel or cast crank/rods? HP rating? Thanks in advance for you help!