96 4.3 to 5.7 swap with no spark

[cudakid]

Have a 96 GMC 1500 single cab that was originally a 4.3. We blew that motor up so pulled a 5.7 out of a 97 Tahoe to swap in. Stole the wiring harness and all that out of it as well. Tahoe was running and driving before pulled everything out of it. Going to to try to start it but have no spark any where. No coil spark and then obviously no spark at plugs. Any ideas on where to start looking? Already changed ecms and tried a new coil. Anywhere else we should look for problems or any other things may be missing with the swap? Thanks

 

[tayto]

do you have voltage at the coil?

 

[cudakid]

do you have voltage at the coil?

Yes, have voltage at the coil and ecm

 

[tayto]

crank sensor plugged in? do you have a scanner to see if theres any codes?

 

[cudakid]

crank sensor plugged in? do you have a scanner to see if theres any codes?

Yup crank sensor is in. Currently don't, looking around to see if we can find one that isn't too expensive

 

[Erik the Awful]

Check the ground on the front of the engine on the passenger side of the timing cover.