I run 5 sets of 901-16 spring with 16 stock intake retainers to ditch the exhaust rotators. on LA small block heads 318/360

all of them on lunati flat tappet cams,1 luntai voodoo roller cam and now on the hughes whiplash roller cam in my 91 318 with 3302 heads.

all lunati springs for small blocks are doubles with damper and need machine work to fit head.

the comp 901-16 drops on with head on engine, uses stock retaners/seals.

hughes spring have a little more seat pressure but less spring rate than the comp 901s = little less seat presure but more spring rate.

what cam are you going with?