I don't know what type of injector the R/T had so I can't speak on that. I mentioned a disc-type injector earlier. In this pic, the 2nd and 4th injectors from the right are the ones I was talking about. The 2nd from right is the 'skinny' injector I mentioned. Both are common in Ford 5.0 and 4.6 engines, probably others, too.

'94-97-ish Magnums have a gray injector with 2 holes in the disc (not in the pic). I don't know what the earlier Magnums had.

Generally speaking, a finer mist should give a better burn, but there are exceptions where a specific pattern is more advantageous. As an example, the Y-shaped pattern (4th from left) is generally used in a 4-valve cylinder head so that 1 injector can aim at both valves.