My truck flooded and would not start. checked compression - fine on 1990 Ford F-250

replaced 1 yr plugs with 5000 miles, is getting fire and fuel which prtessure is fine, exhaust is not plugged, no timeing chain problem. was flooded to the degree that some fuel got in my oil which i let drain thoroughly before replacing w/filter. Still will not start - just keeps turning over - local mechanic can not figure it out either - Help !!!

Asked by for the 1990 Ford F-250