2731lbs for the 13B powered Miata-- heavy but the streetdriven swaps that run the track days with me pull as hard as my turbo jett, 200hp or so it seems.
2635lbs for a BP powered 1.8 Miata-- Thats a lot of weight
2430 for a 1.8L double wishbone FWDer- needs another 50# over the FWDstrut car based on Roll center height and camber gain
2370 for a 1.8 strut FWDer- needs 70# off cuz it has all of the wrong items. Box on struts. try 2250 until it wins.

IMHO you need to run the data for Hp to weight/ and lateral power. No way that any FWD box is going to match lateral with the Miata- within 200#, maybe 300#