1: As Justice suggested , look at the easy stuff.
2: Do an oil annlysis at Blackstone labs. For $20 you will know if there is internal damage, nothing to pull apart, a deal for the cost.
3: As pointed out an improperly installed damper could be the problem and if the crank is damaged, could be the source of the noise.

Do you still ahve the old damper? I would be curious to see how it failed. Did the rubber seperate or did it come loose from the crankshaft?

Kevin

87 Turbo Intercooled Raider, roller cam, torsen rear diff, LSD front diff, lockup auto with modified converter, V6 brakes, low transfer case gears...