With my R-block based 308, I've got 150# springs up front. Now my car weighs 2900# with me in it and is VERY nearly split at 50/50 (I know, I'm working on it). With the heavier 351 up front, I think you'll find most places will recommend something in the 200-225# range. The guys at UPR really know what they're doing with the coil-overs, so you could call there and get their input.
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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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