Having done this exact conversion myself, 8374/1.05 all day.
A dyno sheet only shows show much, actually, throw the bloody thing in the bin.
8374 to -5’s is much more than 300 rpm difference, more like 500-700 rpm not to mention the zing under the foot once you put the twin butt plugs in the dumpster where they belong. Transient response difference between the two setups are night and day... ALMOST 1/3rd the time, the winner going to the 8374. This was shown by logs off a mates car who also went between these two exact setups on a 3.0. Thats something that is not shown on a dyno sheet with a WOT loaded run.
Having also been in two different cars (2.6/baby vcam/-5’s and 2.6/baby vcam/8374), the 8374 would destroy it EVERYWHERE.