I put an A14 in a Spitfire. Some things to consider about getting the engine in the frame and under the hood: 1200 and a lot of A14/15 engines had front sump oil pans, and that sits right in the middle of the frame cross member that joins the front suspension towers on Spits and Midgets. Some B210's had mid-sump oil pans, and that'll get your engine 15cm lower by itself. (Get the matching oil pickup tube as well.) I ended up chopping the front out of the oilpan and welding in the back of a front-sump pan, so there is only enough clearance for the crank. That got me another 10cm. If you can move the engine so far back that the sump is behind that cross brace, you can drop it way down. I don't know how the frame rails are on the Midget, but I couldn't push an engine back as far as I wanted because the 60-series transmission wouldn't fit between the rails anymore.
The position of the oil pump, and specifically the filter, also was kind of terrible for a low/back placement. I ended up going with a remote oil filter, the filter itself on the backside of the front bumper, and that helped tremendously. The drag is that to mount/unmount the oil pump side of the remote, I have to remove the oil pump, to screw the adapter on, but in theory that should be a one-time thing.
It's way easier if you have a RHD midget. LHD means the exhaust wants to be just about where the steering linkages are (and you can't scoot off to the right because of the oil pump.)

And yeah the A14 is way lighter than the stock Brit engines, and the result is quite nice when you get it running.