[Spits] Frame swap on Spitfire

[Robert Rutherford]

Hi all, I have perforation rust in the rear frame rails of my 78  
Spitfire. Am stripping an older frame (unknown year but has 6 leaf  
rear spring) for bead blasting and POR-15 painting.
Can anyone confirm my belief that all Spitfire frames are  
interchangeable?
I understand that the 12 coil front spring from this frame might be  
advisable for lowering the front end and improving handling as opposed  
to the 11 coil used on the 1500.
I will of course use the swing spring from my 78 along with  a Monroe  
air lift shock kit at the rear.
Any insight into what might be wrong with this plan is welcome.

TIA,
Robert Rutherford in Vernon, BC

White 78 Spitfire with rusty frame.
Red 76 Spitfire waiting in the wings (or is that waiting in the  
fenders?)