318 Build on a small budget

Welcome to the site. If you click on the FORUMS tab, then scroll down to small block mopar engines, there is a ton of info there. It depends on how cheaply and how much work you want to do. There's adding power while doing a budget rebuild, and there's add power with a few bolt-ons. You pretty much covered those. I'm not the one to make a cam recommendation though, but I'm sure many more will chime in.
Take a look at this thread in the meantime though.
my Low dollar 318 hop-up project