Yes
Yes it will fit with many modifications.
Yes
my friend put a 440 in his.
not g6yft you take the 318 out first
The short answer is yes, anything is possible (...but why?)
Anything is possible, would not be a direct fit.
I doubt very much they will fit as the bolt pattern would be different.
yes you can make it fit, my friend has a 440 in a 71 demon that was origionally a 6 cyl., he mounted the engine in with engine plates instead of motor mounts.
Yes, they were indentical
Yes there is enough room for the 440, but you would have to make new motor mounts, and driveshaft length would be an issue.
It is not a direct fit, any thing is possible.