backfiring through carb

[mrcomedy104]

im sure this has popped up multiple times, but here it goes again. i have a 72 c20, i replaced the valve covers/gaskets, spark plugs/wires (spark plugs were gaped before installed to .035) after all of this was replaced it started backfiring from the carb, the motor is a 327 off a 67 camaro, my brother and i adjusted the timing and made sure the wires were put on correctly, it idles fine but as soon as i give it a little gas it starts popping from the carb, i sprayed a little carb cleaner in there but im still getting the backfire, i replaced the old vacuum lines, and plugs, my brother said that it might be a loose or messed up valve, im pretty lost now id appreciate any advice or possible solutions

thanks in advance