Cylinder Head Choice

I would like to at least upgrade the converter but I don’t know where to start. What would you suggest I get to replace the stock one?

If I can’t work with the stock 318 heads I’ve got, what would be a good alternative to porting?

Thank you so much for working with me. Im fairly young, I live in a city where I don’t know anyone who understands cars and I’m new to working on cars myself - but I’m trying to learn as best as I can.
I'd have to know what kind of budget you are looking at for the projects. A decent converter may cost you 600+... I wouldn't get a 200 dollar converter, I'd keep the stock one in that case. I'm guessing you have a 7.25 rear end, which is ok with a mild 318 but not a big HP engine. FABO is a great source to learn. Honestly, I have a lot of ground zero stuff for newbies on my youtube channel, heads included. If you haven't looked yet, here's a link. 318willrun - YouTube