You’d be be at max overtime (on level 3 pay - which is after 5 years of service) mixed up with a crapload of day-off payments to make 180k on the 320. 150k is more likely in a really busy year (speaking from experience)
New joiners now will be waiting a LONG time to get on a 787, if ever. - not to be negative, but realistic given the number of aircraft jq operate.
Having said that I would highly recommend it as a career choice. Great place to work, great people (for the most part) and the flying is varied and good fun.