Toyota Repair: Electrical Problem?, kids and money, logical conclusion

Question
Husband had to replace head on 1985 Toyota Truck 4 wheel drive 22REC. Was running when he parked it. Replace head, timing belt went to start it and it would not start. Mech. said computer was out replaced computer. Mech. said Main relay out replaced main relay. The ejectors and fuel pump will not work. Will not turn over or pump gas. Please help this is literally driving him nuts. He has worked on this for 8 months we have 5 kids and money tight has to do what we can little at a time. We were so sure this would work What else  could it possibly be? Please help fast! Thank you! We are DESPERATE!!!

Answer
I'm going to do my best to help you but I will need a little more information so I can come to a logical conclusion as to what the problem may be, you said that the engine ran before the head and timing chain was replaced so it is logical to assume that the engine not running now has something to do with the repair.
I will need to ask a few questions so that I may be able to help, please answer them as precisely as you can:

Why was the cylinder head and timing chain replaced?
Does the engine crank over normally?
You stated"will not turn over or pump gas" what is it that won't turn over?
Is the problem basically that there is no fuel pressure?

Answer these basic questions and I will take it from there, there are  a few possible causes but I may need more input but I'm sure I can solve this problem for you.