Anyone use speed master roller rockers?

I think clearance would still be an issue with a 1.550" dia spring
Typically, hell yes.
Now.. if you implement a b3racing geometry kit... that can be remedied.
The rocker is picked up mostly and brought back some away from the spring/valve.

I'm waiting for a kit to show up from mike now, it has taken some time... but when it does get here I will share some photos using different springs to show what could fit with this kit. It's a $200 problem solver/ power increaser/parts saver...at least I'm hoping and in theory...though like anything... I do expect to have to grind the push rod holes toward the valve cover. It is mostly infrequent that you solve an issue and not create another one when working with existing design restraints .