37coop,
When you see "red" as the description of the color it may not mean "red". There are about a jillion shades of "red" just look at fire trucks for instance. Almost every department has their own particular shade. The 49-51 8RT engines I have worked on have been a fairly dark shade of red that I don't find easily approximated by "Ford Red" engine paint selections; they are all too bright. Perhaps years of oil, fuel varnish, and grease darkened the original color, I don't know. Since you are UK, check out "MG maroon" engine paint color; its not a dark maroon and is fairly close in shade to the paint I have seen on several of these engines upon dismantling and cleaning (engines that appear to have never been apart with date coded Ford bearings). Not exact mind you but a lot closer than the bight red engine paint intended for Y-blocks and some Falcon/Fairlane engines...