Striker,
7lbs is the same as 7psi.
David,
Took a sidetrack.
Very busy at work as I'm now an employee!!  I'll retire soon and have time.
I'm currently building an entire new truck from the chassis up.
I have the Rover chassis on the floor and it's fitted with a Nissan Patrol rear axle and half fitted the front with all Nissan steering.  I'll retain the Rover 4 spot calipers as I want it to stop.
I'm fitting 12.5 x 35 tyres (tires) up from 33" to give me better gearing.  It was a bit undergeared before.
I'll be using Nissan Patrol transmission and my trusty 1UZ to power it.  I ordered the steel to make the adaptor plate on Monday so it should be started in a few days.
The engine is a problem.  Until I shift the spare Argo rods my wife has banned the engine build.  Sounds tough but I do have $12,000.00 worth of rods on the shelf.
The body will simply be transplanted onto the new chasssis.
I figure another $5,000.00 would see the engine built.
I need a new flywheel and clutch and that's it. 
Then all I have to do is get it engineered so I can legally drive it on the road.