400 low buck dont give a

I don't think I would use the 916-16 springs. They are designed for 1.70" installed height. They may have enough free length to be used in the big block application, maybe not. I think I would substitute the Howards 98445 for $109.95 at Competition Products. Outer O.D. 1.46, Outer I.D. 1.080, Inner I.D. 1.085, Inner I.D. .840, 120# @ 1.875", 425# @ .765 lift, 399 rate, max lift .735, coil bind 1.080.