No, I didn't miss the opportunity to install a Cosworth. I'm not a mechanic at all, and it would be too complicated for me to change the throttle cable, wiring, ECU, and probably other things. On this one, I had to reinstall my intake manifold to be able to reconnect everything to it.
Now I've almost finished putting everything back together, and I found the oil cooler gasket (an O-ring of about 2.5 inches) (the part where the vertical oil filter goes). Do you think it's possible to reinstall it from underneath so I don't have to take everything apart again?