273 rotating assembly in a 318

I was going to tell you about the balancing part, but i thought you would know that,and you do.
Find out what the piston weight was for the 273 piston and try to match it to the lightest 318 piston you can find.
If you can find a light enough 318 piston and balance the set to the same weight as the stock 273 piston, then it will cost less for the balance job due to less work and less mallory weight.8)