Its trending.....Proline seems to be the key in equation....The 481X is a stout engine as well, but I think the Hemi has been scienced out a bit further and just flat out works better. If it were me, I would run a Noonan 4.9 Big Dog Hemi if I ran at that level.....But with either power plant, you have to put in the work and the testing and in spare parts...If you don't, your a Duck...These guys are capable of running well into the 3sec zone, and that comes with cost.