I wouldn't think it would have to be fuel grade but something that is not going to collapse or kink. So I guess your new engine will have different valve covers. If your new valve covers have a 1" hole with a rubber gromet then these are quick ,easy and cheap.
http://www.cpperformance.com/p-13639...with-vent.aspx
Then get a set of these and all you need is some hose and your done.
http://www.cpperformance.com/p-14122...gle-mount.aspx

Here's one if you haven't seen it yet.
http://www.offshoreonly.com/forums/s...-arrestor.html

thanks again pickle.
this would be a nice upgrade I can do with the kids and make the wife happy.

Actually if you have a brand new 454 now you may not have that problem anymore. You may have had a lot of blow by in the old motor going past the rings as RHR suggested testing for. That's what creates a lot of fumes to be pushed out the breathers.

Just run hoses to the flame arrestor and be done.

that I did