Head alignment dowel pins

[SuperKirby]

If I remember correctly, there's 4 per head. So my question is, how important are they to have all 4 per head? And if it's pretty important, is there a way to get them in quick fashion, ie less than a few days? I don't see them on Rock Auto's site, and it looks like I can order them from Summit but won't get them before I need them.
I was going to stop at O'Reilly's yesterday but didn't get a chance. I'll call today? I think I have 2 per side. Is that sufficient?

 

[malohnes]

IIRC I had 2 per side, not 4 when I swapped heads.

 

[SuperKirby]

nevermind then. I was of the impression there was one per corner. Just trying to be prepared.
Thanks

 

[Number4]

As mentioned, two per head. Don't forget to use a bottoming tap to chase your bolt hole threads.