Pamco Ignition causing backfire through carbs.

Having a similar issue with mine, I have a rephased one though. And it worked perfectly fine, then I installed the new cam (yes it's in the right inning position) and new valves and it's not wanting to fire... I'm getting spark and my compression is good on both cylinders... At first I was getting just a backfire every several kicks and now it's not backfiring at all even with starter fluid sprayed in it, I ohmed out the coils and all is good with them... I noticed though that my advancers don't have any give like in the video you posted earlier in this thread. They did when initially installed but now after kicking it a few times they don't... I had to get new bushings for it with the new cam... Could they be a littl too snug? And how would that effect the ignition?
 
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