1965 413 Turbo

I used borg warner 66 mm turbos . There well built and the price is write. The nice thing is they post the compressor maps for there turbos. You need to figure out how much boost and hp you want to make. Then you can do the calculations and pick out a turbo. My 66 can make about 1200 hp. As for heads you don't need big valves or ports. I would recommend spending money on porting this way you can run a smaller port and valve but flow high numbers. One more advantage is , smaller ports will produce higher velocity and will help spool turbos.