I need an sr20 water pump pulley and since finding just that pulley seems impossible, I was thinking about picking up a lightweight pulley set.

My concern is my timing. I had my timing set by zfever and I couldn't find any info on if changing pulleys will throw off my timing? By taking off the crank pulley will that mess with it?

Side info, engine is not in the car, its being built in my garage.
I know this is a NOOB question but I'd rather ask a stupid question that will get answered than risk anything.