Speaking of when it's gone it's gone have you seen this on Evilbay?:
https://www.ebay.co.uk/itm/Bedford-300-Engine-TK-S-type-RL/224037794945?hash=item3429b17481:g:wP8AAOSwuRpe0-oJ
Might be a cheaper option than rebuilding yours, looks like an early type as fitted to the green goddess. my original engine was completely buggered and I was lucky to find a rebuilt GG unit from the EFS reserve although it was considerably more than this one...lol
I've just about finished my cab repairs , the usual, doors, floor pans ,lower wings and cheek pieces as well as mounting point's, thought it would never end but its looking good now. Keep going it's all about the ' Little victories !' do one thing at a time as if you look at the whole thing it will just demoralize you.