The firewall is different... the clutch mechanism, the plug for the engine harness etc... So unless you are thinking of changing the entire firewall panel with the cowel panel its going to be more WB than HJ.
I personally would look for a good HJ shell from the same plant if you are going to go to all that trouble. The rear design for the HJ full headlining is unique for a HJ Sandman Panelvan as there was no Kingy PV in HJ. So unless you get another Sandman shell you are going to have to improvise there as well.
Mauser
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