Does anyone have ground locations for this engine handy? Access is so limited that knowing where to look would probably help thanks

 

Ground for what? Usually one near the water temperature sensor in front and a copper strap under the doghouse. Computer has 2 wires I believe,one on intake and one to body out of the harness. If it's a starter issue, you can ground to a starter bolt.
Clean any you find and apply dielectric grease to keep corrosion at bay