Backfire under loads

[liftlawssuck]

So more of an update. I pulled the timing chain cover off and the chain was loose. Not as loose as I had hoped but loose enough. Turned it all over to see if the timing was correct between cam and crank and it was dead nuts on. I took the tool to find TDC and located it and found the timing tab was correct with the mark on balancer. Curious now I took the dist cap off to see where rotor was and rotor was 180* out. well that will make it run like crap!!! So at least I found a definitive problem and will correct it while the motor is all apart so I know it will be installed at TDC. Now the problem is with myself. I know I had brought up the #1 piston and felt compression many times on this motor but man I missed something. This isn't like me and it will eat me up for a week now trying to figure out where I went wrong.