Well think I may have caused some confusion sorry I'll try to clear some things up.

Ok Jerry the running stock 350 I have in the truck now I believe to be a 78 through 81 350 I don't know the exact year. I do believe it to have a 2 piece seal and sure it's not a roller motor. So by your post I'm taking that I should look for a newer 350 to build that is a roller motor.

Ok Techinspector1 I guess my basic question is can a 305 block be bore out to a stock 350 bore safely. It was just a thought and was trying to learn something LOL if I looked at the right spec's on the 305 crank journal size is the same as a 350 crank journal. I was thinking it was another way to build this engine.