A Sherlock Holmes needed to ID 340 springs - Aftermarket

69 Cuda 440 said

Or Possibly

Melling #466114

Height ......... 2.38"
O.D. ........... 1.43"
Coil Width .... 0.18"

Load Rate ..... 105 lbs. @ 1.75"
Load Rate .... 210 lbs. @ 1.20"

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I saw that and also Melling 466444. One shows Chevy applications, the other Ford.

I am going to check valve to piston clearance, then pull the cam. Maybe I will see some casting marks. I suspect it is the stock cam.