If you're curious about the rest of your engine, here's some info on what is probably the biggest difference between all the Windsors: Heads.
Most 302/5.0 heads are kind of the same in terms of performance, with a few exceptions. In stock form, the early 60s heads had rather high compression (small combustion chamber) and small valves, but they're popular for people that want good 'stock' heads because when ported, they do well. The heads are very similar from '67 the way to the 80s, with just a few exceptions: the 289 Hi-Po got screw in studs to help prevent them from pulling out with higher valve spring pressures, and the '68 J-code 302 4V which had ittybitty 53cc chambers to deliver higher compression. Neither was particularly 'special' except for the noted differences.
In 86 (one year only), they got "high swirl" heads, which are universally regarded as bad. It was during the time that quench area and its effect on combustion efficiency and detonation prevention became known, but they didn't get this one quite right.
In '87, the E7TE heads were rolled out, and got used on everything for many years. Very very common heads. Ho hum performance, and not worth really spending any money on. If you really know your stuff, and spend many hours porting them, you might have something that flows slightly worse than a good set of stock junkyard GT40P heads. Maybe. But they work! And they're better than the high-swirl '86 heads. They're on par with the original 302-289 heads, but with a little less upgrade potential.
In the 90s, GT40 heads came out. Slightly better, offering better breathing than the E7s. Used on Cobras first, I think, along with 1.7 roller rockers.
In the late 90s, as the 5.0 was being phased out, they produced the GT40P head, which had significantly different intake and exhaust port shapes. The valves were slightly smaller, and yet they still outperformed even the GT40 heads by a large margin. They were used on Explorers and Mountaineers mostly, along with weak valvesprings and a low-lift very mild cam that peters out around 4000 RPMs - but still managed to produce power similar to that of the earlier 5.0 HO Mustang engines despite this deficiency.