Ross, dyno headers are about the easiest headers to make, you may want to just make a set to keep around for dyno testing. I did that with some SOHC headers, and use them whenever I have one of those engines on the dyno. My dyno has actually been modified to make it narrower back by the bellhousing, so most headers will fit, but there are some that require me to bolt the engine to the dyno up at the front, usually in the holes at the front of the head or the block, rather than using the stock mounts.