rocker arm geometry

heres my problem (putting together a mild 360)
when checking the valve tip to rocker arm tip center
the roller are just about to roll off the tip the valve

i've heard this could be a problem with a large lift,but alittle surprised that i got this issue
running a mopar 292-509 cam and 340x heads
running a 1.6 on the exhuast and a 1.5 on the intake
the 1.5 ratio's are the problem not the 1.6
can someone school me
and how to fix this

thanks for any help