Outer Limits 4x4 Board

I have a conversion problem. I try to change the 3ltr. engine to 4,2 ltr diesel I have so far spend in exes of $1000.00 and have not rceived the right gear in spite
of the Information I have given to a number of suppliers .Can some body who has made such a conversion give me some information on such a conversion ?
It would interesting to know how it was done.What I need as far as I have found so far: 1 engine harness to suit a 4, ltr.GU diesel
The ECU to suit that Harness and any other bits and pieces witch is required t o do the job.
Cheers gilge

What yr 3ltr n 4.2?, 4.2 bell housing, starter, throttle cable and pedal assembly, if uve got the donor car there it's best, few hoses ull need to get n bits n pieces