Did you switch to 11/32 or5/16 stem valves, I don't think the retainers come in 3/8 and you cannot use your stock retainers. Big blocks have a large diameter spring so I would guess you would have to cut outside diameter of the guide to clear. Why would you need beehive springs except to clear rocker arms and rev to the moon just asking
Call during business hours to get a good tech last time I called about retainer recommendations for 911 springs they said I needed titanium retainers for single hydraulic cam springs. Make a list of questions before you call.I would call comp and see what they say I am sure they have been asked this before.