TFS TW heads have 2.02/1.60 valves.
The AFR's probably have a different placement of the valves than the TWs do - that may be why they are telling you that they won't work.
Hope this helps,
E
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1991 5.0 LX Coupe - 38,000 miles
13.17 @ 106.14 mph w/ 2.138 60'
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