Rocker arms for 408 build

where the roller sts on the valve is not important unless it is close to the edge - or off
narrow stripe is what is important
roller tip raises the line from trunion to center of roller the radius of the roller from the valve tip
you just cocked the valve close up about 3/8 of an inch for a 750 dia roller tip and same with valve open
SNAFU
you have to raise the fulcrum so that when the valve is at half lift
a line through the fulcrum and the center of the roller is parallel to the top of the retainer or perpendicular to the valve stem (same thing)
easy to see with the engine on the stand and a machinist rule held on the fulcrum-roller line
you may need longer studs
you will need correct length pushrods