Not Ranked
If you use the explorer motor you will not need new lifters as they are roller lifters and do not "wear in a pattern" into the cam. I just pulled the intake off the explorer motor and pulled the lifters, pulled the front engine cover off and the timing chain and put in a trick flow stage one cam from summit ($140). You will probably need to change the springs as these stock springs are marginal for a hot cam when new and the guy from trick flow said if yoiu have over 50k on the engine to put in new springs. I think there are several you can get from summit like crane cams or trick flow.
The 1997 motor has the best Iron small block head that ford ever produced except the boss 302 head. It will make at least 25 more HP than the GT stang heads stock and there are several ponies to be found with a little head work.
I run my Cobra with my soccar mom motor on gainesville and roebling and it holds its own and has never let me down(except for the FIREBALL incident at the Willis last year whick was my fault not the motor)
Good luck
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