There are a lot of comments about which vintage of LQ4 6.0L to use as a transplant or upgrade. Why is there a preference for a 2001+ LQ4 vs the earlier versions. Other than the iron heads are ther other issues that need to be addressed. I plan to use a 2000 LQ4 6.0L with a matched 4L80E and transfercase for a transplant into a OBS 2500 4x4 91-95 vintage. Is the earlier 6.0L not a good choice for a build up if I plan to swap the iron heads out for LQ9 heads /cam etc? My aim is to upgrade the powertrain in a OBS for towing/offroading with newer/better components than a TBI 350.

Thanks