I got a 283 in a 61 impala, we replaced the cam, we got the timing marks correct, we got fuel and we got fire to the plugs, also got the rotor button pointing to the #1 cyl. and all it does is spit thru the carb and won't try to start. I'm lost. I've done several 350 engines and never had any problems. this one is kicking my butt. it was running before just couldn't get it timed thats why we changed the cam, and boy was it worn the lobes were round and not egg shapped.