Just got info on the latest build at my local shop. 464ci 428 with TF heads, .630 hyd roller(246 @ 50), 11:1 pump gas with I think a Victor Jr, tri Y headers. 610 hp at 6200, 580 ft/lb at 4500. Nice streetcar motor.
Compared to:
My 462ci, .63 flat tappet, 12.5:1, tunnel wedge, 625 hp at 6500, 590 ft lb at 4000 rpm with 20 yr old Eds with hand port job that flows 280/220(same as Barry's heads).