Those aren't valve guides, those are pushrod guide plates. At any rate, anytime you have a pushrod guide plate, it requires the use of a hardened pushrod to avoid what exactly happened to you. Any mechanic worth his weight in salt would have known that when he installed the heads. Chalk it up as an expensive lesson learned and have a reputable engine building shop do the repair work. If those were the stock pushrods, they probably weren't the correct length anyways.
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Jeff Chambers
1990 Mustang GT 10.032 Seconds / 137.5 MPH
14-time Street Warrior World Record Setter
CRT Performance
2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH
2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2
"There's nothing boring about a small block automatic shifting gears at 9400 rpm!"
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