I could understand that cheap headers will need some work to fit.
The RH side is just AFU though. The engine sits deal level in the bay.
There is one pipe pressed against the pan and another wedged against the torsion bar. The 4 pipes are routed together at that point. This is just piss poor manufacturing. An engine with crash damage or worn engine mounts will certainly cause some fitment problems but I have a stock 360 oil pan and .85 T bars. The idler arm is a stock type, not the longer Fast Ratio one. I had to unbolt the steering box and move it against the fender apron to get the extra 3/4" to get the LH header in. Now it looks like once I move it back over to bolt up it will be really close.