Maybe you could buy a whole engine with ecu and everything. Take the head off the one you have and put in a new head gasket to lower the compression then add all the bits from the other engine. After this you can sell the 2nd engine as is to someone else who has blown theirs up and doesn't need all the bits and pieces that you have pilfered.
Doing it from scratch the way you are gives you the chance to go straight to after market computer, exhaust, bigger injectors and fuel pump maybe, etc.