what heads to run on a 273

toolmanmike as i was looking at your engine rebuild i noticed the windage tray is the same as i was thinking of getting,Is that the Milodon? but what i wanted to ask was the windage tray install kit, was it kit 81151 for the 340- 360 or the 81182 318?.Reason asking is im finding it difficult to track down the 81182 318 install kit thats if i need it and can use the other.Cheers