Autolite 103 or 104, depending on the heat range you like. I've also run Autolite AR474 for a short-tip, side electrode plug if you've got plug to piston clearance issues like I did. These are two heat ranges colder than a 103 though so they're best for a high compression race engine.
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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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