1984 Ford F150 won't start

While driving my buddies truck just up and died on him. I went and tried to help him get it working again but ended up calling the tow truck. The truck is getting fuel and spark. We also replaced the Ignition Module, coil, starter relay, and the ignition switch. The truck turns over fine but it won't fire up. We did a compression test and all the cylinders were the same but the readings were low (around 50-60). The only other thing i could think it could have happened is the timing chain jump. That why the low compression and it won't start If anyone has any other ideas before i Tear the motor apart would be appreciated.
THANKS

You might want to try this first, Set engine at top dead center, pull the dist. cap and check the position of the rotor. see if it's pointind exactly at the #1 post or if it's off a little bit indicating a jumped chain.

I never thought of that . That I'll try that this weekend. THANKS