Thanks @timbo - certainly some options to think about there!
But meanwhile, it's back to the drawing board for the engine mounts. The Yoshifab off-the-shelf B230 into 'vintage' option isn't going to work with a standard 140 crossmember.
I jury-rigged a 140 front end under the engine while it was in the stand. Presuming the use of standard 140 / TC Cortina 250 engine mounts, the necessary alignment is miles off.
(For those unfamiliar with the old stuff, 140 and 6 cylinder Cortina engine mounts aren't like 240 mounts with offset bolts and dowels in the centre; the mounting bolts are located in the centre of the mount, like spinning tops).
The angle of the engine mount flanges isn't suitable for a 140, especially on the RH side.
So much for off-the-shelf solutions! It appears it will be necessary now to home brew something, because these ain't never gonna work the way they are. At least by home brewing, I maybe able to fit the standard ancillaries bracket!
Are Amazon / 1800 mounts a different size to 140s? I don't know if this is so, but I suspect they are. If so, maybe somebody may have a use for them, then. Otherwise, they're just a pair of very expensive ($195 USD + shipping) dust collectors AFAIC. Nicely made and painted, but not suitable for intended purpose.
@carnut222 here's a better pic of the Yoshifab conversion LH engine mount; you can see the third bolt in this shot.