I currently have a 66 malibu 10 bolt, 4 link, 3.08 rearend (non-posi) with a turbo 350 trans a 350/350hp engine and 265/50 15 tires and would like to add posi but am not sure if the rearend will hold up. My intention was to add posi and increase the ratio to 3.55(about $800), go to a 12 bolt(about $1700), or try and find a stronger 10 bolt with this ratio & posi setup and can easily bolt up to my 4 link.I do not intend to drive this car hard but will get on it now and then.Any suggestions or experiences that will help me decide the best option would be appreciated.