A518 Flex Plate Help???

Ok, so I should be ok with a 2800 stall from http://www.transmissioncenter.net/SwapInformation.htm then right? I will just go ahead and get a b&m flex plate to go with it. Does it come already pre balanced to work with my setup though? Also, I grabed some 3/8 lines off dodge van when I was at the junk yard last, so I will be using those, and then I got the largest cooler I could fit too, made by TCI. I also installed a trans temp gauge, so I can keep an eye on the temp. I installed the temp sensor in the pan of the trans, so what would be the normal temp for the 518?