azkiwi,
To do a valve adj in a flat 6 cyl, I would not say it is easier. T IV motors have 8 adj and they are all on the bottom. A 6 cyl motor has 12, 6 on top, 6 on bottom. It is aslo much harder to determine when each cyl is on TDC. However, since the motor is overhead cam, the number of adj is less. Typically, I pull the motor and inspect everything and then adj the valves, much easier in the long run, IMHO.
Also, IMHO, if one is going to do a coversion, a flat 6 is a great way to go
However, a big 6 will run about $10K to do correctly
914-6 3.2