I just Google that player's 40 time. A 4.3 will get the player a 94-96, depending on that players OVR rating, if I remember correctly.
Keep in mind, the first post of this thread I mentioned I'm not a ratings expert.
I think the lowest rating I have on a prospect is 54, but he's dropped big time on the CBS big board since I created him. There's quite a few guys in the 60-65 range
I have a chart I use and it (again, mentioned in the first post) may be a tad high. The highest rated prospect is 83. If a guy is projected to be drafted in the 7th round, I normally have them rated a 65....so that gives you an idea of the "range" I used.