I just bought a set of Profiler 210cc Heads for my 408.. they also make a 195cc ver better for a 355. Most of the heads you guys are talking about flow in the 200-225 Range... good for 400-450 HP at the most... the profilers I bought flow over 300 cfm... the 195's flow in the 280 Range, which is good for about 550-575 HP... there have been many tests done between Dual plane and Dual Quad Intakes... the Dual Quads look cool, but don't make as much power as good Dual plane (Air-Gap) with a 750 Carb. Unless you do a Full on Tunnel Ram. The heads I bought were fully gone through and Setup By Chad Speiers
http://www.speierracingheads.com/profiler.htm.
If you want some serious HP at a reasonable Price, these are the way to go. they cost $250.00 less than AFR's But flow as much out of the Box. With some port work 700HP is possible with a 406 sbc.
