1998 chevy 1500 trouble codes?

ok to start with i just had to replace the heads on my 1998 chevy 1500 z71 and put the distributer back in and cheked it with a scan tool and that all checked out good and i have drove it for about 200 miles and the dtc lite came on and the truck is still running fine but these were the codes on there po131,po171,p0300,p0430,p1345 please help i have no idea wut the heck any of these are and how to fix them.

http://autorepair.about.com/cs/troubleshooting/l/bl_obd_main.htm

The P1345 may be the root cause for the rest of the codes. It means that the ign timing is off. Needs to be set with a scan tool that can access "Cam retard" or "cam offset". In this mode the timing needs to be 0 +/- 2 degs with engine rpm at or above 1000.