Well, at your weight, 1.2g/lb would equate to around 180g of protein. However, you'll do better on 1.5-2.0g/lb of protein, to be honest. So you wanna be aiming for 230-300+g..try to get 300g.
I know this seems hard when you think about getting it all from tuna - tuna out of the tin takes a lot of energy to open, drain and then chew through...so get it from different sources..
- chicken
- beef
- protein shakes
- protein bars
etc...
Seriously, getting 250g of protein, which is basically a minimum for a guy of your weight, is not that difficult. Drink whey shakes with 50g of protein at a time, with a tablespoon of olive oil in to add fat and slow down digestion, chug down as a meal
Ground beef, beef mince..make chicken and beef (including mince) into curries, chilli con carne, season them and/or put sources on.
Make omelettes, they're awesome
Get cottage cheese down you..
It's not that hard when you get to grips with it, really
-shaun