TR$A coil springs

[TryumphTR3@aol.com]

     I need to replace the coil springs in my TR4A IRS with stronger units 
and was wondering if anyone can help with spring rate?  I noticed in the Moss 
catelogue that conventional springs are rated at 280LBS and they sell an 
upgraded spring rated at 350LBS.  With a solid 4.10 rear and 205/50 radials, my 
sway 
bar mounts were actually scrapping the ground after certain turns at Lime Rock 
this past weekend.  

Any help is gratly appreciated.

Thanks

Jerry Faiella
67TR4A