410 LA small block will not rev past 6000

Well if around 114 mph is 6000 rpm peak hp should be around 5252 rpm (100 mph) and peak tq should be around 3950 rpms (75 mph). Should this engine really be pulling hard a 1000 rpms above peak ? Is it breaking up at 6000 rpms or did they just let off the throttle ?

Edit* There actually looks to be a peak hp spike around 94 mph about 5000 rpms.