There is a long history to that. Mopar Performance used to say that the 050 number was meaningless and they wouldn't publish it. Then they said that you could multiply the advertised duration by a factor and get the 050 duration. I think that is where the 236 number comes from. Then they changed their tune. I don't recall seeing the 241 number but that could be what they say it is now. The 243 number is probably what I measured in my engine but it was 20 years ago so I'm not exactly positive. The odds are that the 0.528 is somewhere around 240@050 so that is what I'd shoot for if I was ordering a cam for the OP. I don't think it matters a whole bunch, I'd just shoot for something in that general area with a lobe design that is street friendly and a lobe without a ton of lash. The MP 528 has a lot of lash, 0.030 or something? so that could be tightened up a bit with a modern lobe design.