Dual tank kinda expert here.
Switching valves change feed.and return to each tank. Controlled by a relay, the pull and return to front tank or rear. Parts can be ordered off shore or Cruiserparts in new Hampshire has the newer versions as take...
Chicken tax (LB Johnson) is for 2 door trucks w bed.
Gray market protections (1988/89 Reagan) make the 25 year rule hold
2010 Obama era EPA limit engine imports to 21 years old.
ENS Industrial in Saskatoon has been working with mine trucks since...
You might take the horn button off and see if anything is moving. Remove the two plastic wings at 9 and 3 oclock on back and I think they are Torx head screws. If you have airbag look to service manual first!
I have used Cruiserparts for parts- for new take off parts- (on and off for 20 years) but the idea of a reman unit or other engine is 100% off the plate. Not the right shop for mechanical moving stuff esp requiring a core...
Something like this would greatly help the assembly. I was unfortunate enough to start my build in 2013 and had a long uphill battle
The gas harness passes thru the cowl metal primarily on the right and would a bit of a trick to match to hz/hd...
Well I have factory 2011 HZJ7x axles from the oft seen decapitated blue hzj76 sold on eBay on my 79 series build. 5 lug axles. Converted from drive plates to standard free hubs in a dirt carport of a Tucson, Arizona rental in 2017.
Original...
43405-60120 is birfield for free hub and auto hubs. The drive flange birfield is shorter and is 1-2 splines different.
I have
https://febest.de/en/details/outer_cv_joint_24x59x30-0110_057
in my truck. maybe not OEM but they seem to work well...
At least a 1PZ is post 1989 engine. Toss a grenade in all those engines prior to 1990.
And, as I advised someone a few years ago in New York the PZ is cheap and later when you are ready a 6 cylinder hz/hd/etc is a drop in.
hd-t require pulling pump that does not effect the timing gears.
There is no way on earth to remove the cooler and cover without the pump being removed.
this is typically what a bad cooler looks like.
Poor coolant maintenance over decades can cause internal corrosion to build up especially in the oil cooler (behind injection pump). An Oxalic acid (wood bleach) flush followed by neutralization with Baking soda helps as well as physical removal...