KA24DE not starting?

[89hatchman]

I bought a 90 S13 parts car that had an S14 Ka24de swapped in. The guy said he's done everything that needs to be done to run it in a SOHC S13, engine harness, modding the dash harness, different ECU, etc.

But it won't start.

The engine cranks, the comp in the cylinders are good, its getting fuel (plugs are wet when I pull them out after a bit), its getting spark, timing is correct.

What could it be? It won't even start when I give it a shot of starter fluid

All that happens is it'll sound like its almost about to catch, a few pops through the exhaust.