Looking to boost the power of my 318

Well if I found a set of old 302s out in a junk yard somewhere, and had them gone through completely to actually make some decent power, I may have well should have bought a set of new better heads. I know for a fact that porting and having heads machined costs a ton because of all the time and work involved. I was quotted $1000-1500 for a slant six head a while ago..