Rb will not start anymore??

[Currpt_God]

so my transmission took a s*** in my 240 so it had been sitting in my garage for 2 months and i had been startin it up and lettin it run for a while every week, then i went on vacation and it sat with out starting for three weeks and when i got back now it will not start.... i tried jumping it and i tried swapping with a new battery and it just will not start, it clicks over like its going to but does not ?

o and the engine is a rb20det just incase u did not read the title

any suggestions?thanks