stock rocker spacing.

Hey guys, thanks for all the replies.
Here's my setup.

Stock 360 from a 77 truck (could tell because of the pan).
I bought this from a rebuilder as a fully rebuilt long block.

Hyd lifters and such.

I bought the Mancini cam kit
Purple shaft 340 grind
MP lifters
MP push Rods
MP HD Springs
Comp retainers, etc.

I have the #1 at TDC and am able to slide my stock rocker arms side to side. I didn't measure the Up and Down movement that I have.
I'm just getting ready to dissassemble to install my new valvetrain parts and was concerned that I may have a problem and was wondering if this was normal. sounds like it isnt. I think I should go with new rocker arms and shaft and spacers with all the other work I'm putting into this, huh?

Thanks again guys, you've all been a real help. Hope to meet some of you at fling in May.

- Stu