No spark

Hi, a customer brought in a car someone tried to swap the engine for him and long story short it doesn’t work. Needed misc sensors, knock harness was ripped, and some buttoning up. Got it all together and car Cranks but no start. The car is missing spark. Every fuse in the engine compartment panel and the interior panel is good. I scoped cam and crank sensors and the patterns seem normal, unless they’re slightly out of spec they seem uniform. NATS red light is out while cranking and turns on when key is out, so I believe that is functioning. Fuel is on plugs. Guy had the grounds placed on painted areas of the block and I relocated them to no avail either, at least the ones in the front. ECM can communicate and has no codes. No codes in four modules (that’s the only ones I can com with or see listed) used consult ii to run self-diagnostic came back with no error in system. What am I missing here? Is there a specific ground for the coils? I checked all the big power and grounds at the ECM and they seem okay. I even checked a couple of small pin ones. My wiring diagrams on Prodemand are slightly off, they give me the automatic ignition circuit, but I was able to work through that mostly. What can I check or where do I start? TB is responsive and fuel turns on and sprays.