I have a 350 in running condition but ready for a overhaul. And a 400 that has sat for about 15years in the garage, and was "starting to smoke and leak a little" says the previous owner (Father). I'm considering rebulding one, so some questions I have are; Not bored or stroked, which would you prefer 350 or 400? What grit cylinder hone should I use? 60, 120, 180, 240 etc? Lifter valley oil baffles, opinions? Engine oil cooler? I have an Edelbrock Performer RPM intake, should I drill/tap for a rear coolant cross over? Phenolic or aluminum carb spacer? Block/heads? Orange or Flat black? I believe I will do is; use the SBC 400, hoping it does not need any machine work and all the old parts are reusable. Port and polish the heads. Use Lifter valley oil baffle, buy or copy out of Stainless steel. Sandwich style oil filter to run a oil cooler. Phenolic Carb spacer. I have seen some guys would make a side to side rear coolant cross over that T's off to a 1 inch spacer under the thermostat "allows air bubbles to easily work there way out".