Ok I bought 89 Toyota 4x4 pickup looks like the motor is 92 or so is there any way roughly identify year of frame it has the independent front suspension I'm having trouble with header fitting I need figure out this Frankenstein to get parts right

 

The engine casting hasn't changed..
​​​​​​Find the vin on the frame and compare it to the cabin.

You got a poorly made header is very likely, or just need to figure out which way it was intended to slip into place.