Tattersfield manifold with dual Strombergs

[vincent]

Engine rebuild is almost finished and I will fit a high rise dual carb Tattersfield manifold. On the old engine I ran a 97 Stromberg (9510A) with standard jetting.
The new engine is a french flathead with 4,2 ltrs, nothing special inside except a lightened flywheel. Should I leave the jetting well alone or is a change neccessary?
Thanks for your advice!
Harty