Oh dear!
The difference between the 86 and the 88 is all in the engine bay, and the major panel difference from memory is the mudguards. Someone should be able to provide dimensions, but I think it should be fairly easy to modify the 86 chassis to 88, although it is also possible (but unlikely!) that someone here may be able to supply an 88 chassis.
I think the front spring hangers, rear shackle anchorage and cross member are all moved forward 2", but you need to get this confirmed.
John


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