O.k. So I got the f20b in. Didn't change the timing belt because everything looked fine. Took it out for a test drive and it was fine. Adjusted the distributor and it seemed fine..got about a 1/2 mile down the road and there was an abrupt drop in power.. almost like the timing had been severely retarded.. I drove it home but there was now a distinct rattling sound from compressor side/region that increases with RPMs. I reset the distributor and the power was back..but there still remains this sound. Any thoughts? It sounds like marbles in a can...this blows.