Main jet tuning... ...in France

Hi AJ,

Thank you for the interest and sorry for the lack of information.
Engine is a 383 with a 650 cfm double pumper carburator. Camshaft exhaust duration is 228*, and intake is 223* but I don't really know what does it involves..
Here are the camshaft spec :
http://i1354.photobucket.com/albums/q692/nlangebe/IMG_2845_zpsmkxz08lm.jpg
Power valve is stock (6.5) like all the other tunable things on the carburator, fuel level is fine...

So you think I should have bigger main jets?

Cheers mate,

Nico