Early 4.6 Mod motors, are they worth using?

[Mercury]

I believe the early 4.6's are the same as the pre 99 4.6's as in terms of block casting, heads, mounts and such. Not sure about compression ratio's or Piston Types.

I'm probably wrong, but I do believe Cam grinds were diffrent between models, and the Cam specs changed in 98 for the 4.6 Mustang. The cams for the 99+ 4.6's are diffrent also, they have less duration on the intake side, but more lift.

I wish there were more books out on the 4.6 Liters. I would love to know more about the engine, and the cam specs per year per model, and engineering tidbits. You can find a billion books on the Small block Fords, Its time they made some on the Mod Motors.