FB RX-7 Compatability with AE86

[jamiemirror]

Like Nick says - FBs are good cars and it's better to recover your than using it for AE86 donor. Especialy if you have running rotary engine in it.
Better make 2 lists with parts/labour required - for AE86 and for RX7. Then freeze the more expensive project and do another one. It will not hurt to protect the engine, body and interior using sun visors, waxes, oil etc.
About the swap - IMHO engine+gears will fit in AE86 chassis and are good upgrade. Last FBs use rear end with LSD and vented brake discs - I heard that these can take over 200hp without problems so this swap can be most economical way to touch 200hp (rotary) AE86 - in your case.
Note: RX7 rear end is solid but uses Watts links instead of Panhard bar. You must work a little around that.