Mopar Stage VI 6 heads questions

Ok I’m in the planning phase for my big block combo and I have been doing research on the stage 6 heads I’m going to use. I have read many articles on these heads and have seen many different builds being done. I have seen guys posts about the engines they are running these heads on including the cam size and what not and it seems the more I read the more questions I have.

Questions I have at this point.
1. How much value lift will these heads take out of the box?
2. Do I need offset rocker arms?
3. Do I need custom length push rods?

Here is more info if you need it.

So the heads I have are 4532134 casting from the mid 90’s. They are not the early design that had porosity issues and are not the Chapman heads. They are just as they were out of the box, never been milled or had any port work done.

The Mopar description of these heads say they can be used with all stock big block parts, valves, rockers, push rods, use a RB intake on a B engine and use spacer plates on an RB engine. That all sounds good.

I tried to find a spec or installation sheet from Mopar but no luck and I can’t find my Mopar engine book. So I start doing some research to find out how much value lift the heads can take and I start finding all kinds of different info. Some info says max lift is .600, other says .630, another says .675 and one post I found the guy says he is running a .700+ lift. The problem is the posts that I find don’t say what work if any was needed to get that kind of lift. I did find some info on not to have the valve pocket cut for taller springs because it will weaken it and a stiff spring can cause it to fail.

As I’m doing this research I find posts saying you need offset rockers and custom push rods to use these heads but the Mopar description says they work with stock parts.

Thanks in advance for any info.