I have a 1969 morris 1000 that has been sat in the garage for nearly 3 years now, pulled it out today and had a look. Some of you may remember the supercharger conversion I had some lots of fun/trouble with a while ago!
It needs a few odds and ends to get it back on the road, mostly engine related. It is a nearly finished 1275 conversion, I cant remember what the block is from. It has a metro ported head and a few other mods that again I cant remember. I have a pair of HS4 carbs that I can probably make one good one out of, and a hs4 cast iron inlet/exhaust manifold with standard minor exhaust. Also an alloy inlet manifold. Is a hs4 too small? My main concern with the engine is that as it has no covers over the cam followers (see photo) and the rocker cover has no breather, so the air inside the engine is completely sealed, do I need to find a rocker cover with a breather to prevent leaks? Im keen to get it back on the road now, its been too long since I last had a go in it! What are your thoughts on the carb? Also will the standard radiator and fan cool this engine?
Picky[frame]
), a HS4 will work on a 1275, it was standard on the marina, but a 1 3/4 carb offers more power, especially if the engine is tuned.
Breather rocker cover is good - and you can fabricate another breather using the hole in the block where a fuel pump is sometimes installed. A single HS4 will be fine to get the thing running - worry about upgrades later once it's MOTd and on the road. You can fit 2 fan blades - crossed - if the single two blade proves insufficient in the lovely warm summer ahead.......... 
I look forward to following your work. 
Going to have to label them all so I can make sense of it all.