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call or notify a bone/junk yard they have the cross reference charts for vehicle parts or try a gm dealer these are a few that are compatible 97-99 Pontiac Bonneville SE 6Cyl 3.8L 231CID VIN K Fit Note Engine VIN: K, Naturally Aspirated 97-99 Pontiac Bonneville SSE 6Cyl 3.8L 231CID VIN K Fit Note Engine VIN: K, Naturally Aspirated 98-99 Buick LeSabre ALL ALL 97 Buick LeSabre ALL ALL Fit Note With Harness Codes: HEN, HER 97-99 Oldsmobile 88 ALL ALL 97-99 Oldsmobile LSS ALL ALL Fit Note Engine VIN: K, Naturally Aspirated 97-98 Oldsmobile Regency ALL ALL
Hey Carlton, you can find most of what your looking for at autozone library its all free and no spam but your first choise should be to go buy an auto repair manual for 20.00 its all very well spent and you'll have a great reference materal .
If this is a very high mileage engine it sounds like you have a rod or crank bearing that is worn out. If the knock is more of a thump than a click that would be my guess. If it is a tick more than a knock then it can be a piston pin bearing or a stuck hydraulic lifter. Either way, stop driving this car until you can have it looked at by a professional or you may end up with a blown engine.
How long have you ran the engine ? I know that they will run rough and sometimes make strange noises for a few secounds or a little bit untill everything get oiled up again. I would make sure all the push rods are back in the right place and that all the lifters are tight.