Which one is it the first pic or the second? Early 69-74 (or there about) Windsors had a slightly shorter deck height and 16 manifold bolts, later had 12 manifold bolts. Performance wise an Edelbrock RPM manifold would be better than any Ford one.
There was some boat that came with a 5.8 just like the 1st gen Lightning. It had an iron gt40 lower. Boat makers like iron. It's cheap. It'll take massive abuse. And boats have plenty of reserve flotation so the weight doesn't really matter.
Agree with Illusivefox, it's most liekly iron, but if you check it out and it's aluminum you could use it. Actually you can use it either way but why bother bolting a heavy iron pig intake on a Mustang? The short answer is yes it'll bolt right onto a passenger vehicle 351W.
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