Yes, clamping the front half of the leaves tends to make the front half of the spring act like a lever helping forward bite. Leaving the rear half unclamped allows the spring to still react to compression forces. Try to get 2 clamps on each spring if possible.
A turnbuckle on the LF of the engine going to the frame will stop destruction of the rubber mount and make the car safer. Those 2 bolt 45 degree mounts have a habit of breaking, ask me how I know...................LOL
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Brad Yost
1973 T/A (SOLD)
2005 GTO
1984 Grand Prix
100% Pontiacs in my driveway!!! What's in your driveway?
If you don't take some of the RACETRACK home with you, Ya got cheated 
  
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