Can't quite get it running

[lukecp]

I can't seem to get my truck to run after swapping heads. I have got the motor fully assembled back together, and i tried to start it a few times. First, it backfired a little bit, so i thought i got the distributor in wrong. So, i put the #1 cylinder at TDC on the compression stroke, and set up the distributor so that the rotor was directly under the #1 spark plug wire terminal. I then tired to start the truck, and it backfired pretty bad again. However, it backfired almost as soon as i turned the key over, where before it was taking it several revolutions to back fire.

I have checked the firing order, and it is fine. I know the truck is getting gas (i can see it in the fuel filter, and i can hear it squirt down the carb if i operate the throttle), and i doubt my coil or module are at fault since they worked just fine before i tore it apart.

This leads me to believe i have adjusted the valves too tight, since it was my first time adjusting them. I tightned them down until i couldn't move the pushrod up and down, and then went another 3/4 turn. Should i try to adjust them again, but not quite as tight?

I really want to hear the truck run again, i haven't drove it in a week and i am sick of running around in a minivan all the time