Daewoo DB 33 engine

The compression is fine, I replaced the piston rings and had the valves resurfaced, and I installed the timing belt according to the timing marks on the gears, but there's clearly a timing issue (difficulty starting, slight knocking when accelerating). The injectors were checked and are fine. I don't know how to interpret the injection timing marks and I want to rule this out before removing the pump and sending it for repair. Thanks for your help.