I am new here and I am also rebuilding a 390 for my 73 F100 4x4. I am building it to tow with here is what I got going on. The block is being bored out 20 thou, the block is being decked, the crank is being ground and balanced, the rods r being balanced, the pistons r being balanced, I'm putting in a pro comp cam that performs between 3000 & 5000 rpm, double roller timing chain, I got a full head job done, the heads r truck heads with the smaller ports. I'm using the stock two barrel intake manifold, with a new motorcraft carb. I have the motorcraft electronic ignition. I want to upgrade to the flame throw 2 coil and ignition. I want to get headers but I don't know what ones. Should I port and polish my heads? I am looking for suggestions for anything else I should do. I'm hoping u guys can help me out with ideas. That's why I signed up.