Thank you for the input! Just to clarify, the second photo is of the old/stock blue painted valve cover prior to the engine rebuild. We don't plan on using the stock valve covers anymore, so the valve cover breather can't be used. Do you think it would suffice to just route the tube to the filter bonnet (by which I'm assuming you mean the air cleaner but please correct me if I'm wrong)?
Definitely want to try and minimize gas vapor in the engine bay. I've heard people talk about using charcoal canisters to do this, but not sure how something like that would be fabricated/installed. Any input on this would be appreciated.