Well, with a better flowing engine, then you would need somewhat richer
needles. BUT the TR3 intake and exhaust manifolds are not as good as the
TR4A versions. So, maybe you would still need richer needles, but maybe not.
If the car seems to run well, then you probably do not need different needles.
For an improved TR4A engine, SM needles would be a good option. For your
engine, I am not sure.
By the way, a TR3A manifold is designed to use the longer H6 carbs. The short
HS6 carbs are supposed to use a long runner TR4 or 4A intake manifold. Short
mated to short will probably give worse flow characteristics.
-Tony
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