Thanks for the replies folks. short on patience for the injector line removal I took off the pump and lines complete and then went on to struggle with a couple injectors. I think for all the work involved it's as good a way to go even to get at just the injectors. The pump bolts were something I was familiar enough with and removing the pump/line assembly was not to bad a PITA. Gonna try and acquire a 12 point 5/16ths socket tho for reassembly.
I suppose it would be worth having the pump bench tested. It's not a leaker and has a service sticker with the truck at 350k KM +/-. I do get a lot of smoke and I'm not sure I like that. smoke definately went down when I advanced the timing some time ago but I'm struggling with smoke on cold start up and it's worsening. Also, a cylinder does not fire for a bit when cold. But cost is an issue not sure what spinning it up on the test bench would or should be and what all I would get into for all the trouble an old work truck is worth.
cylinders 4 and 6 were not cooperative and 4 especially seemed heat baked. I found oily injectors on the 3 and 5 especially on the passenger side making me wonder about the oil control and compression. Valves on cylinder 4? Will see what I discover with the test.
Thanks '92, I'd definitely prefer going the less mess route. now to drop in re-bushed front springs and shackles and the missing plow bracket. oh, and assess glowplugs and may be restore timer module with one from a later 90's van. Thanks again.