That is correct, I meant to say the 360 "style" balancer. Although I have seen the manual flywheels listed in a few books as the same but I never used one. I've always tossed the 72-73 340 cranks and used a pre 72 steel 318-340 cranks in them.
myasylum, you will be fine using the parts from a 318 on your 360 a used balancer will be also fine, just make sure the rubber isn't dried out or cracking.