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I've got a SA1071 engine with a 544 camshaft, worked head etc.
At the moment I'm running a single HS6, but I don''t really want to.

I've got the choice between twin HS2s and twin H4s.

Would the HS2s be too small?

depends if youre going to rev it hs2's would be ok, but i should imagine there would be more top end with the H4's

if you thin down the butterfly spindels on 11/4"s there as good as 11/2's in most instances.

I'm thinking of fitting an SW5 camshaft, so I guess the Hs2s would be great over time. I don't rev it, it's a street car. I'm getting lazy

If you are fitting an SW5 then its the same engine as my Sprint. It works fine with 2 x HS2's but if I had my time again it would be 544 & twin H4's if they fitted under the bonnet.