hi all just put a new 350 in my 69 El Camino musta done something not right but I'm tired and just can't figure it out.  It is a almost stock 350 with a HEI dist. It is running but keeps backfiring through the Carb and a mid range miss and wont shut off with the key keeps running on ........ Valves ? timing ? dam my brain is fried........ Help
 
Matt Levenson

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