Pulling a 603 head is no big deal. There is a sequence to loosening and tightening the cam bearing bolts but it's less complicated than the head bolt tightening sequence.

If the secondary pump is the injection pump. That's not a terribly complicated job either but you need special tools or a keen understanding of pump timing to get it set again.

Engine shock and spring? On the serpentine belt?

Sixto
95 S420
87 300SDL