273 Stock & Elec ign questions

The vacuum can normally points towards the passenger side. With #1 at TDC on compression stroke, the drive slot should be pointing at the intake manifold bolt in front of cyl #1 (forward most cylinder, it is on driver's side). The rotor should then be pointing to the post marked "1". Note that most Mopar V-8 dist. caps are for both SB & BB and have 2 posts marked "1". Use the one with the cw rotation arrow. As 67Dart273 says, you don't have to use the marked post, just as long as the rotor is pointing at the post with wire going to #1. A 273 shouldn't be any different than a 318-360 and either a points or electronic distributor will work as intended.