If it is indeed a CAV DPA pump, you'll have to access the front of the inj pump drive gear.. Theres a plate infront of the inj. pump. {rad.side} prob. about 5-1/2 bolts, remove them..
The rad coolant line likes to live right there so u may have to get it out of the way..
Once u gain access to the front of the inj. pump drive gear, theres 3-1/2 bolts that need to be removed.. Once that's done, DO NOT TOUCH/MOVE THE GEAR..
It might be smart to mark the gears to each other if your worried about it moving..
Now look for the timing mark on the inj. pump mounting ear.. it'll be the closest one to you.. theres a line on it that corresponds to either a mark or timing degree marks on the block.. They may be painted over 15x but they're there.. some gasket remover & a razor blade will be your friends..
IF your going to make your own marks.?? DONT DO IT ON THE MOUNTING EAR.. chances are very good that you'll crack the housing.
Once the front is loose, all u have to do is remove the lines & linkages & remove the 3 bolts holding the pump to the block & wiggle it back..
OH, DO NOT REMOVE the levers.. they are needed during the rebuild process.
Good luck & contact me if u need further instructions.