I reckon a plan is forming either way. There are so many routes Steve can take and some interesting suggestions. Recently I have been thinking over how attached you can become to a car, and it is very easy with a 300, with it's character. There is a point however when you remember that the purpose of the car is to serve you, but at what point does servicing and maintenance turn into preservation and a costly labour of love? In the end we are serving the car! However, great enjoyment and a huge sense of achievement can be had from this, it jsut depends upon what you want, what your budget is and if you have the time and skills!
Currently, my 360 needs a downpipe, part reserved, time to fit non existent and the 15" rims swapping back onto it. It also needs a rear arch tidying where the tinworm has attacked, then filling with waxoyl and a damn good clean. The 340 is taxed, MOT'd and ready to go for another year, but I think I'll do an oil change soon, but I'm avoiding winter use for it, as it's so damn tidy and I never got time to Waxoyl it before winter. Then there are just a few little jobs to do. Basically, what I'm saying is neither car is a daily driver at the moment, and if the truth be told, both are redundant, infact if I ever had a sensible head on, I would have sold any car I owned when I bought a van! But, that was never going to happen, and I'd never sell either of those cars! Somehow I will always keep those two cars, even if they are taken off the road, I will aim to keep them running and in the best condition possible.
The choice is Steve's at the end of the day, and if I were in his shoes, unless I tripped over a stupidly cheap and *perfectly* clean car, with no signs of rust to swap all the pimptastic and nice parts from the saloon onto, then I'd wait see how the MOT goes. If it passes, grand, it's another years motoring, the bodywork unless dangerous with sharp edges is only cosmetic at the end of the day and a DIY repair will suffice to tidy it up, take some measures to prevent more rust and enjoy it! Add a 2.3 and enjoy it even more.
If dropping down to one car is more sensible, helps with costs and meets your needs, then swapping the running gear to the 343 and making an interesting project is cool! And as you said earlier, if your not doing stupidly high mileage, then fuel economy isn't an issue, stick some big carbs on and have fun driving it.
Personally, I treat the 340 and the 360 as completely different cars, they are so closely linked, but are so different in the way in which they drive and feel, mainly due to the transmissions and engines, I could never replace one with the other, or justify or name the better car of the two, as each does the same job differently. I think you'd miss the 360 if you were to get rid of it, but then it's what works best for you mate.
As I say the offer is there for help and workshop space, and the engine crane is on standby for when you get a B230 of some kind.......

Also combining it with a meet would be a grand plan.
Pete
G reg 360 GLT, G reg 340 GL Variomatic, plus many more..........