Exhaust backfire even cylinders only

My exhaust pops out of the even cylinders aka passager side could it be my cam?

 

Have you checked your wires? Firing order?

 

Pull plugs see if they are black or wet.

 

Yes it is correct 18436572 and everything is brand new

 

If they are what does it mean

 

check carb gaskets/vac lines for leaks, ensure distributor parts are properly assembled

 

I learn so much form other people's problems. Hope you get it solved @Dom8
Keep at it

 

Intake leak on passenger side only, maybe? With it idling spray some carb clean or brake clean where the intake meets the head and if idle changes you have an intake leak.

 

Black or wet plugs is a sign of not firing or too much fuel.

 

All plugs where wet the person who built the motor gaped them for hei ignition

 

So, correctly gapping them fixed the problem?

 

Should have atleast improved how it runs

 

Yes it fixed the problem but iwasnt able to reuse the old ones had to spend 50$ for all new plugs