well yeah you could put them on backwards... then just fip them around and your good to go. below is a pic of where i ground down the tabs on both sides of the injectors.
Nelson- Make sure you get the high impedence injectors.. then you won't need to wire in resistors. I have never done that... but its not too hard to do. Also, the 460cc injectors have a tab on the inside of the plugs (on injector) that needs to be ground down... or just get the rx7 plugs with the injectors.
my injectors are part# 1350 on the chart below.
http://www.robietherobot.com/s...e.htm