Help me please tryin to beef up 318

okay so what would be the consequences of me putting the 360 heads on with a really thin gasket?
from the 650 carb performance intake plus the cam and headers im getting would i have a chance against that 5.0?
sorry if im just running around in circles and if it means anything to anybody onces i graduate college and have started my career im going to pull the 318 and probably put in a big block