Chevellecamino69

ima drop my motor in my el co and have to wire it up but i only have the harness and computer i sure i need a fuse/reley box which i don't have. the shop i bought the engine off of suggested i send it to a shop in Ohio they charge 320 buck and label it and fix anything damaged and reprogram the computer they told me once i get it back its pretty much a plug and play is there any other options i heard of this one guy paying 7 to 8 hundred bucks to wire there cars up thanks in advance