How to identify "302" heads???

So, originally I was just looking to confirm the heads I'm told are on an engine that I'm buying for a 70 Dart GT I'm building are 302 swirl port heads. Since this has gone waaaay past that - and I've really enjoyed all the information that has been shared - I should answer 273's question - I'm building a car to use for looong distance road trips - like on the road for months at a time, going from coast to coast and back. Rt 66 kind of driving. The car needs some get up and go, especially in the bottom end, it might never see more than 5000-5500 rpm and it can't break the bank on gas. I'm currently thinking of using a Silver Sport automatic that has very low 1st gear, wide ratio spacing and a really high overdrive 4th gear. As compare to a TQ, with 3.73 gears it should have 1st like 4.30 gears and 4th like 2.70 (something) gears.