Rocker arms for 408 build

Found my login info for Moparts (hadn't been there for years) and came up with some interesting stuff. The circle track racers use this method to make the stock rockers adjustable by cutting off the square base, replacing it with a polylock. Of course it can't be as stable as a pedestal but apparently it works. They use a pedestal with a 3/8 hole, listed below and mount it on the 5/16 to 3/8 adapter studs.

magnum heads swap? - Moparchat - Home of MOPAR enthusiasts worldwide!

Here is the best way to do it and have adjustable rockers like a cheby.
get Comp cams guide plate # 4825-8 18bucks, Comp cams rocker studs # 4504-16 (5/16x3/8)65bucks. If you want to use stock magnum rockers get mopar #p4876514. This is the rocker folcrum with 3/8 hole. Cut the bottom of the folcrum off with die grinder. I will post a pic. Or you can use a chebby stock rocker but it will have to be a 1.6 ratio or you will have to grind pushrod tunnel. Get a set of 3/8 polly locks and you have adjustable system. Have been using this system for 2 seasons with zero problems

Mopar Performance P4876514 in our Camshafts Department | Autoplicity