Gearbox noise. Last T1 IRS

[MattKab]

Time is near to rebuild my trans. I've long wanted to fit a Porsche5 but I'm now tempted to fit a Quaiffe for the ~same cost with T2 CV output flanges. My trans is a AT prefixed '79 single side-plate 3.88 that works perfectly and the ratio's are sweet on the motorway compared to the 12/13 but the bearings are starting to get a bit noisey. Worst in second. I don't suspect the diff. Am I right in thinking It's the main shaft bearing that can be seen when the nose cone is removed?

Will the Quaiffe fit my trans?

I can't find ANY info about my type of trans! It looks awesome next to an earlier IRS. Can any one help?

Does it have a particular name?

I'm keen to rebuild it to a more functional spec', that's what it's all about in't it

Matt