Hello, It sounds like you have the supply for the computer hooked to a line which goes off whilst the engine is cranking.
take a line from your battery + and connect it to the supply wire on the
computer. If you have the big plug at the end of your harness, about 9 pins in a square arrangement, I think it is the big white wire. check it out.
You can make a quick connect by hooking up to the high side of the coil, that will go back and power the computer too. Should run.
The wire to your distributor will be blue (with a black return).
Turn on the key and listen for the pump running. you should be able to hear it quite easily.
Make sure your Throttle position sensor is plugged in properly and of course your inlet flapper too.
There is little that will stop it from starting if you supply the power right.
Good Luck.