Steve, I am just going to "watch" it, as I honestly expect it to go higher than I will be able to afford. You are in a far better position than I am to take this thing home, so if you plan on going for it them by all means go ahead, I, likewise, would not bid against you......
As for the engine, it's going to be a Vauxhall unit, as fitted to their saloons. There may be common ancillaries with Austin/Morris vehicles. The Vauxhall and Austin engines of the period did have a lot of similarities.
A UK-based Vauxhall/Bedford club may well be able to provide information.