Length of the shaft on intake valve?

Hi,

I got my hands on a pair of rebuilt 915 heads a couple of mounth ago.
Now when I was planning to mount them I see that the shaft on the intake valve is a tiny bit shorter than the exhaust valave, if I look at the cylinderhead in its lenght I see everey intake valveshaft a little bit lower than the exhaust valveshaft, about 0.03 lower.
I think they'd use a different brand of intake and exhase valves.
Is it possible to use stock lifters, pushrods and rocker arms? Or do I have to use adjustable pushrods on either exhaust or intake?
It's a bone stock 383 4bbl.