So I've had this 87 5.0 for a while its been my slooooow project. I had it sitting for about 3 months and recently replaced the fuel tank and fuel pump due to the tank and pump going bad. Right after I replaced them it fired up and engine ran but was backfiring and I figured I needed some valve lash adjustment. Well now it won't crank up at all. It turns and all but just won't start up. I have fuel up to my injectors I've messed with it but can't seem to figure it out. Anybody has any ideas? Timing?