When John built the car he replaced the rear cross beam support as well as fitting an ARB at the rear, so there should be some improvement rigidity over the rest of that series chassis.
There are still improvements that could be made as it has the original uprights with the inherent 40mm between ball joint centres although as I recall he did level the ball joints.
The copper pipe plumbing John used could be easily replaced for larger bore pipe but it could be a lot of work for no good effect if Steve is correct.
If you have the capability to measure the inflow and outflow temperatures of the rad that may be indicative of problems in your case that would be easily achieved. Based on these readings air flow or blocked rad could be quickly identified as issues.
JohnC
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