1972 360 Balancer with 1967 273 Timing Cover

you're going to have to get creative with the pulley spacing because the dampener is thicker. you'll also need to elongate one of the holes to make the crank pulley work.

the smarter/easier play is to find 360 pulleys that match what you're trying to do-- ie ac/no ac, ps, double belt on the fan/alt. and then just use the 273 cover and call it done.