I contacted Eaton Spring Tech Support today and chatted with a lady. I asked her for a standard front spring for my application. She told me all they had was the HD spring as listed with NPD. I then asked her to look into a 350 CI car's application to see what was available that may cross reference over for my application. She was less than helpful and said what was listed is all that they had. Woj, what I was attempting to do and get into a discussion with this lady is exactly what you pointed out. I feel certain that there is a correct spring listed somewhere for the 69 BB non ac cars that are not F41.
FWIW, I bought from Rock Auto a standard duty non ac Moog spring for my BB convertible 69 Camaro. The were perfect ride height and improved drivability 100%. I went ahead and bought the Eaton springs from NPD but they are not installed yet. I did check with Ground Up and they have the same HD spring that Rock Auto has. I can't find a BB non AC non F41 spring listed unless you go the route that Woj suggests.
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65 Corvette Coupe L78
67 427/390 Vette Coupe unrestored
67 L-79 Vette roadster (Top Flight)
69 L71 Roadster Survivor
69 L46 Roadster Survivor (Sold)
69 Z/28 RS
69 Dodge Charger R/T
70 W30 442 Auto Air Survivor
2016 Z06 Coupe M7
70 AAR Cuda (Sold)
69 L78 Chevelle
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