The back firing is generaly timing If that was right I'd check the dist cap. I'd guess the hose blew off because of overheating. What rad. cap are you using? or was the clamp just loose? I realy haven't a clue why just one tube would be glowing unless the valves aren't adjusted right, and that could cause the backfiring also. Hang in there there are a bunch of otheres on here that should have input.
Also Welcome aboard your in the right place