1966 valiant Post engine swap?

The engine mount brackets need to be altered to fit the 360. The LH one needs to be narrowed or shimmed and depending on your particular 360 block casting, you may need to cut and move and ear or two. Some 360 blocks have 3 mounting bosses on the block but they are a different 3 than the early 273. You are going to have to figure out what you're going to use as an exhaust system and bell housing/clutch too.....and radiator, brakes, rear axle, etc......you get the idea....it's a process!