RHS head valve train??

They should provide plenty of room. I have Harland Sharp rockers (which are probably thicker in that area because they are aluminum), with a set beehives that take a 1.185" retainer, and no clearancing. I think the biggest beehive retainer is 1.320", which would provide over .060" more clearance over yours. But it all depends on what springs you end up with. There are beehives with smaller retainers also.