[turnpike boy]

Valve float? With solid lifters? If it is, then he assembled with the WRONG springs in those heads; AFR is good stuff, as long as you tell them what you're using. Think maybe you need to sit him down for a little talk - with all the exhaust valves making contact I'm of the opinion that either he never checked valve clearance or the cam timing was never checked.

A crying shame; truly feel for you.