This is just my opinion , I would just use a real good fpr like you listed above instead of a s-afc to control fuel. They have a bad rep for causing more detonation ,what your trying o stay away from , from advancing the timing and you dont realize it cause it " tricks "the ecu on a 2nd gen. Now on a 3rd gen , since it has a map sensor and no afm they are actually somewhat usefull because 3rd gens are velocity tuned and not metered by a huge box with a flapper in it . Its just an opinion I got because I was going to do this type controller and after seeing what are some negative side effects , I decided not to. FWIW.