361 engine specs

Where can I find out about 1965 361 build info. The car that I am getting had a 361 in it. The engine comes with the car but the car has a 1968 440 currently in it. I am being told that a 361 and a 383 we very similar. I would like to build the 361 to make it have some get up and go. I plan on rebuilding it and then building the 440 for my wife's bracket Dart. I cannot seam to find any info on it or a good combo to build the 361 to get the most out of it.