There are differences in the water jackets on the 2 blocks.
Even if you change cams. I'm not sure you can do that swap. Shite doesn't line up right internaly from the block to the head. Although it will seem from the exterior to line up perfectly.
You can put the gte cams into the na head for some increased throttle responce. All of that shite starts adding up to seconds if you do all of it and then some.
The people in supramania are elitist snobs and they haze new people. Been that way for years and isn't going to changge. But tis a vast pit of knowledge. There is also
The Toyota Supra Forums .
This is one of the top 2 sites though. IMO.