Here's a video to make you 410 should of had a better heads, happy.
They swap on 1.6 roller rockers and single plane intake, basically killed the bottom end and made a new baselline of 438.7 hp @ 5,500 rpms & 448.2 tq @ 4,700 rpms, then ported out the heads and intake for a 92 hp and 900 rpm gain to the peak power for 530.8 hp @ 6,400 rpm & 488 tq @ 5,200 rpm, be nice to see same mods done to the 367 :)