cam ?
For springs, its up to you depending on the lift and the lobe/ramp rate of that cam.
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You should check since they typically use a smaller base circle so you can install the cam it might be longer than 7.4" but you would need to check and measure preload, there are various methods but the easiest is getting an adjustable pushrod and checking the length. I use the other way but it is not the most reliable.
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