Flywheel for 6.2

I have a 1979 Chevy camper special that I put a 6.2 diesel engine in about 25 years ago. I rebuilt engine. Haven't used truck in years, started fixing it up . Engine, clutch, pressure plate have about 10,000 miles on it. Problem is, there is a real bad vibration from clutch area. When I push in on clutch pedal, vibration gets less. I removed the trans and throw out bearing and started engine. Still had bad vibration...I removed the clutch and pressure plate and vibration went away. I ordered a Luk, heavy duty clutch kit. Haven't put it in yet. The casting number on the flywheel I have is 14022675 N. Is this the right flywheel. I understand there were two flywheels used. I don't want to put this together and have this bad vibration back. When I first put truck together back in 90's there was no vibration. I can use all the help I get. THANK YOU..