Kno3
Whilst it is possible to do what you say, there is absolutely no need.
The TVR1A is symetrical (in that it has the same length crankshaft extension at both ends, and the fywheel, if fitted, can be fitted at either end) so all that will be required is to turn the whole engine through 180 degs. and then fit the Steam and Exhaust manifolds the opposite way round.
(i.e. flip them 180degs)
This could also permit the valve operating levers to be adjacent to each other, rather than on opposite sides.
That said, this was not what I was refering to in my previous statement..... what I was trying to get accross was the fact that you cannot just change the pipe connections over (as you could do with an oscillating engine)..... since this would put the incoming steam on the underside of the slide valve....which would cause it to lift off of the valve port face.
Hope that is now clear.

Best regards.
AlexC