Stock 340 springs vs comp 901-16

Actually, there is a fair difference in those springs. The 910 have a spring rate that is 353 lbs/in versus around 250 lbs/inch. So they are better at fighting valve float. I'd use the 901's... for those times when you just fee like revving it out... which WILL happen LOL

What is the cam's maximum valve lift? And the cam PN or make/model? (Lift is used to evalulate maximum spring pressures which is one thing that effects lifter-on-lobe pressure at the cam, and so does ramp rate on the cam. I suspect you don't want super high pressures on the lifter-to-lobe contact as that just increases risk to the cam.)