Longer possibly, any change from stock, such as sinking the valves, longer valve stems, aftermarket rockers, etc, can and will affect geometry and the contact point on the valve stem. I needed pushrods that were longer on my 292 build.
Lots of good info on the Comp Cams site, as well as this board.
I strongly recommend you get a checking pushrod (Comp sells them) and a light weight checking spring and discover what length gives you the correct rocker geometry and valve stem contact.
I got my custom pushrods built by Smith Bros., very fast service.
