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I had a 1974 manta ralley with th 1.9L . that came with 7.5CR dished pistons and hydro lifters . rated at 75hp , there is the early 1.9L with 9.0 flat top with mech lifters which was rated at 90hp (I think was from 1970-71 ).
Those changes and I changed out to a weber progressive DD with a bit of rejeting and venturi size changes (stock carb was 24/28mm) and I ran 25/26mm .
This gave much better response from engine .
Ed
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