One side tank is dangerous enough, but two!!
Alloy inside boot tanks look good as well as being more safe than side tank, however the cost

Capri (not 3.0), toyota celica or Gemini (is that how its spelt?) tanks will all fit and you still get large 13 inch spare (or two) in flat on the floor.
MK2 drop tank would be ok, as well as droping centre of gravity down lower as long as you stay out of the forrest