Need help with rockers

[69 roadrunner]

Guys what i have going on is I got some mopar stage 6 heads and rockers the rockers are .450 offset they wont work. I called mopar perf. summit racing and harland shaft they all say they take stock rockers. where can I find specs for stage 6 part#P4529335 I need specs in writing to prove to this guy they wont work. That way he will refund my money Thanks steve

 

[67 coronet]

it states they use stock valve train in the mopar performance parts book i have.you just need a copy of one of those.should be able to find it on line as well.