Thats awesome and I hope to figure it out as well as you have, But Im willing to learn and soak up all the info I can because for the last 3 years Ive been on the forum even before I Made my account just learning and Im glad I can finally get my hands dirty. And maybe even learn to do little head work techniques.
Go to you tube and search the name “Charlie Servedio” who has done two different head casting of the 318 from a basic start to a full porting. You can follow along with his videos and do your best to mimic the work.
I just posted his video link above. Scroll down and find the first video where he starts on the head.
Search Facebook for “Killer Carbides” for expensive but VERY well worth it buts to whittle away at the ports.