Re: windsor vs modular
Either the 300 Inline 6 cylinder, 5.0L (302) v8, 5.8L (351) v8, or the 7.5L (460) v8, or the 7.3L (444) Diesel. Either the engine intake will have this on it or the Emissions label somewhere under the hood.
If it is the 5.0L or 5.8L, it is a Windsor. Modulars started in 97-later F-150s and 99-later Super Duties.