Hey there, I'm looking to replace the timing chains on a 93 Sentra with the GA16DE engine. I already have a factory service manual and this appears to be a huge job. what I would like to know is how long should I expect this job to take? and what this should I be looking for while I'm doing this. Also what parts would be recomended replacing when the front part of the engine is already torn apart...timing chains and sprockets of course but I'm also considering doing the water pump, thermostat, belts, valve guide seals, front main seal and possibly the oil pump. If there anything else I should consider please let me know. This is my everyday car so I'm not going to do any major performance mods to it but if there are any small and cheap thing that can be done let me know.