Just thought I'd revive this thread. apparently, the DP head is the hot ticket, according to this post:

TurboFord.net Forums: Dual Plug believers come inside....

I know where there are a few of these heads, one is cracked beyond using and might be a candidate for me to learn with.

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record breaking '75 Maverick bracket car 2 time track champion, '84 Mustang LX bracket car, '78 Fairmont Futura, '86 Merkur XR4Ti, '95 F250 PSD, 00 F150, '03 SVT Lightning (DSG) #888