SL-6 Timing is What???

i have question that's bugging me. Right now my timing is set at 5 deg BTDC in my SL-6. Lots of people say "bump it up to at least 10 - 12 deg BTDC. Wow....hard starting I assume and engine runs hotter I think.

can someone pls tell me why this recommendation exists? My car is a 1968 Dodge Dart 270, SL-6, A/T., no A/C. Very nice and runs like a top except for kick down inconsistent, carb adjustment I hope.

Many thx...great forum, great people, great experience.

alan