What you want is the engine from either a 84-86 mustang SVO, or a thunderbird turbocoupe. The engines are identical, the 88 TC has a larger stock intercooler, but it is mounted in a way that wont work with Z car hood, unless you made one. And I speak from experience (I have a 86 SVO ) they are one of the best 4 cyl stock engines there are......( I'm not saying it can't be improved upon, but I run 19psi on mine at around 312hp and 296ft/lbs on pump gas (91 octane). Only thing you have to watch for is to buy the right computer, the ones you want are PE series (any SVO) or the LA3 (a little cheaper and not as aggresive, from 88 TC). I know people who push near 400hp with the motor bone stock internally I wouldn't push mine past 360hp unless was a fresh build, mine has 119k on it If you can find a wrecked SVO go for it, especially if the trans is still in the car, world class t-5 Oh yeah, it you get one DON'T use the knock sensor, they are way too sensitive, pulls too much timing when no detonation happening