http://forum.ih8mud.com/60-series-wa...p-86-fj60.html
http://forum.ih8mud.com/60-series-wa...ec-begins.html
check these two threads out. I'm no expert...but we took the hood off, used a piece of string or tape across the fenders to create a "hood Line" for reference, and then we tried to center the engine. We ended up having to weld up one of the holes on the advance adapters mouts to get the postion just right (for the left and right alignment. We also went as high as reasonably possible to clear the front driveshaft and no to hit the hood line. I have the advance adapters engine mounts as well as their bellhousing adapter so my front to rear postion was fixed. This makes a pretty tight clearnace between the water pump and radiator. We probally should have tried to get my engine better "centered " in regard to being "square" with the radiator but I was planning on running electric cooling fans so it was not a huge deal to me at the time, but given my engine orentiation at the raditor I don't think I have enough clearance to run a mechanical cooling fan. When I said weld up one of the holes...to further explain we could not get the mount to align just where we wanted with the given holes...so my friend welded the hole up...and we drilled a new hole to get the alignment we needed (will make sense when you see the engine mount adapters from advance (the part that bolts to the engine where you adjustment is for left and right alignement.
My setup is a 5.7 vortec engine along with yota manual 5 speed. You might want to get a sliver star (membership) so you can do some expanded searches. There are a number of threads where guys did some engine swaps. If you read through mine you'll notice we had some issues at times with some stupid stuff but I guess that happens with this kind of modification.