Head Port size

Hey All,
I'm going to be looking for an Aluminum Intake to replace my cast iron spread bore factory intake. I have a 318 with 2843675 heads. Can anyone tell me if these heads have a small intake runner or a larger intake runner?

I'll be at Carlisle this weekend and hope to find something there. I know the Eddy LD4B is a small runner intake (square bore) as is the Weiand 8007 (spread bore). I want to get a manifold to match my heads if possible (Yes I know I can gasket match the heads if necessary) :mrgreen:

Thanks in advance! :cheers: