273 318 interchangeable parts

I'm also interested in this swap. I also have a 67 273 non poly,but have a newer 318 & 60's & 70's have the timing marks on different sides. Do you change balancers too? I also heard the pilot for the converter is different for the 67 & down than the 68 & up.I have an 87 318 truck motor that I would like to put in it.