The 360 has a larger main bearing journal diameter...
They also made a change to the flange area of the thrust bearing on the 360 to increase strength/wear capabilities somewhere around 74 and it may have been a mid year change if I remember correctly...
But the 273-318-340 are all the same...
I would also warn you that some rod bearing manufacturers have eliminated radius in the end of the shell opposite the anchor slot for the oil squirt hole in the rod... They claim that you don't need it, but I am not willing to be the test guinea pig to prove or not... I prefer to run the rods and bearings with the oil slot and want the bearings to be made for it also... It's better to have a little too much oil in the bore than not enough, the oil ring will scrape off any extra....
Make sure that you let them know that you want the rod bearings with the "hole" for the oil squirt holes if you want them for your engine...
