Oil pump/linkege

Im not getting any oil pressure, through research I've learned that there no oil pump on this car its some kind of linkege. Coluld you tell me what parts would be need to fix this problem. A local mechanic told me I would need to replace the head gasket oil pan gasket timming chain cover, ect. The head gasket was just replaced and to me seems un related to the repair. Also I was told it would take 11-12 hours to do the job. Is that a fair estimate of time for this repair? If you could tell me all the parts requried and a fair estimation of labor Hrs. For an experianced mechanic it would be very helpfull.