What year of Explorer?
There are certain things that will make or break this swap for you.
If it is a newer long block (with a roller cam and GT-40P heads) you will benefit from swapping the cam out of your GT engine as it has a better profile. Other considerations are external bolt ons and most important is your Smog Pump. GT-40P heads aren't built for air injection and will need to be drilled for that, but can work. Also of important with these heads are different headers as the spark plug positions differ from the E7TE heads on a stock H.O. engine. The factory headers will not fit.
These heads will also really benefit from more intake and exhaust than is on a factory '95 GT.
If the engine is an earlier non-roller cam engine, don't use it. Also, if it is a non-H.O. engine, the heads will suck rocks. The E7TEs on an H.O. motor are restrictive enough, but the heads on non-H.O.s are scary. Also, if memory serves me correctly, the pistons are different and don't have any valve reliefs thus not allowing any room for head and cam swaps. The factory H.O. pistons already have enough problems with cam and valve fitment, there's no need to compound the issue with pistons that lack valve reliefs.
As for a remanufactured engine, an important thing to take into consideration is balance. When engines are rebuilt material is generally removed from the rotating assembly and can make for a bit of vibration during high revs. So, if that matters to you, you will be taking a risk.
