I have a full and a 3/4 tray and will probably install a scraper when The motor eventually goes together. I'm not sure which tray would be better. It's a 400 and will be around 400-430hp(hopefully) when done. Seems like I heard something about the 3/4 tray being better. Not sure why. Maybe just because the full ones tend to crack around the bolt holes? The pan has a horizontal baffle(stock pan). Not sure what motor it came from. Any comments?