If you want all of your criteria met the Ram Jet is the one. Quite a bit more money than the ZZ, but more complete too, and with a relatively simple computer. You will have more expense in the fuel system to support it. All that I've heard has been rave reviews for drivability, economy, and power. It has the same mounts as the block you mocked with. If you get into the LS engines, then you'll run into having to change mounts again.