So after a strip and clean of the carbs, and a long discussion with Tim to work out the adjustable choke/ jets are not original ( so possibly the carbs),
The length from bottom of piston to underneath lid is 3 inches
The lid is vented and script reads ‘Remove and use thin oil monthly’
Has been previously repaired with solder in lid
As unknown when car was last actually running, some of these parts may have been for cosmetic effect!