I'm shopping for heads for the 446 Fury, and think I've narrowed it down to the Trick Flow 240's.

They're offered with 2 different springs, one is labeled for hydraulic cams, the other for solid rollers. The rates are:

1.46" spring, 120# installed, 1.90" height, 394# open at 1.175", 390# rate
1.55" spring, 135# installed, 1.95" height, 430# open at 1.25", 420# rate

I asked Trick Flow's help line and they just gave me the spring specs and said to ask the cam manufacturer. Since the cam is ancient and is the older 590 grind I figure I'd ask here first. I did search and got a range of answers but figured I'd ask again, and also saw a suggestion that the recommended MP valvespring was garbage, lol.

I don't plan on revving it past ~6800ish, it still has stock rods and the heavy TRW 2355's in it. Is the 1.46" spring enough to keep it out of valve float, or are neither of those options an acceptable choice?

Thanks,
Nick