UPDATE:
Turns out that it was not a cracked manifold problem, or anything that an oil additive used in the oil could fix.
As I was growing more pissed off at my 4.0 as the days went on, (been ticking since Oct 07) and after a straight year of MMO, type F ATF, cans of seafoam in the oil, (sometimes as low as 3 qts of normal oil, and a cluster**** of additives and changing my manifold... nothing was close to improving the issue.
Last week I bought another can of seafoam, and instead of throwing the whole can in the oil, I sucked the whole thing into the intake. Took about a minute to use the whole can. I let it sit a half hour. When I fired it up, it didnt tick at first, but when I went to rev the engine to start clearing the smoke, it went "tap-tap-ta" and it was gone. As soon as the smoke cleared, I drove around for a half hour in silence. I can't tell you how many times at red lights I had to look at my tach to see if the engine was still on.
It has been 2 weeks, and I have not had my engine tap since I used one can of foam in the intake.
All I hear at idle now is my injectors and my noisy HB.
Question: What was ticking that mimmicked a lifter tap? Im guessing carbon buildup on valves...anyone?