engine building questions

[bmxmon]

Hey, im starting to build my 302, and have a couple of questions. First, its a 79 302 out of a truck that is goign into my mustang, and i was wondering if anybody knows what the end ring gap is supposed to be. Also, whats the best way to go about making them wider, if they need to be. When putting in the pistons, do i have that little notch/arrow facing toward the front of the engine, or pointing toward the front of the engine? (the wide end of the arrow, which looks like a triangle, is on the edge of the piston) And, when putting in my camshaft, it shouldnt have any kind of pins in the back of it right?? What i remember is that the old one didnt, and it just goes against that plug in the back. When i put my timing chain on, do i have the little dots next to each other or 180 from that? Thanks for any help, kinda the small things i over looked that could really screw up my engine in the end, so thanks for the help.