Ok so i have a car that currently has an olds 307 motor in it, as some of you might know it is nearly impossible to find performance parts for that engine, so i was considering putting an olds 403 into it instead. I have been told that this engine should bolt right up to the stock mounts. Is this true? Also idk much about transmissions, and was wondering if i could stick with the stock tranny if not what should i put in place? Keep in mind i would like to keep it auto like it is now. And my final question is does anyone know of a good site to find performance parts for an olds 403? I have found many parts but they are all on different websites.