comp 981 springs for 206/206 roller for iron heads

for a roller with .496 lift (using 1.55 ratio rockers) and turbo . for a 206 flat they ould be ok but i wouldnt go to them for a roller
thats a 105lb seated pressure spring at 1.70 with a 1.15 bind good for .490 lift , if you shim them down to get higher seat pressure they will go to bind
summit has them in set of 12 but you need more seat press
so which ones should i purchase? i was probably going to use stock rockers,
champion usually supplies their irons with kmotion K750 which lists as a 130# at 1.70 485# rate 1.05"coil bind
installed at 1.65 with a shim should get approx 155# at seat and still be safe to avoid coil bind
hopefully you have your guides cut down for roller cam lift or youll hit the guides
Verify lobe lift before selecting any spring

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Advertised Intake Duration: 258
Advertised Exhaust Duration: 258
Intake Duration at .050 Inch Lift: 206
Exhaust Duration at .050 Inch Lift: 206
Intake Valve Lift: 0.496
Exhaust Valve Lift: 0.496
Lobe Lift Intake: 0.32
Lobe Lift Exhaust: 0.32
Lobe Separation: 110
Intake Centerline: 110

would the comp 6853-12 lifters work as well?
bison should have johnson lifters , the 653 are std travel and without doing adjustable rockers you dont want to try limited travel due to fact youll need to be much closer on the pushrod selection will need to assemble with your chosen lifter and only then measure for pushrods