Not to hijack this thread but i can answer a couple of your questions regarding the K series engines as i was a Honda guy before i dove into old Z's. The K20A3 is the worst K series offering, you wont make anywhere near the power OP has made even with boost. I would say 300 hp is probably about the max for that motor. It does not have "real" VTEC, it only has variable valve timing on the intake cam. The valves are smaller in the head and the pistons have a weird shape as well as being lower compression. All that being said, its still a good engine, especially for free 99 lol. If you can do your own fab work swapping it in a Z will probably cost you a few grand still but would be a fun setup and quicker than an L series engine. The great thing about doing it using this engine is once its done your setup for a K series and you can find better K series options in the wild for very reasonable, so down the road if you wanted to upgrade, its just a simple engine swap. Hopefully this helps.
