Most WD's have a straight shift lever but some 53's are curved (The year Allis switched from WD's to 45's) BUT all 45's have curved shift levers. Also the 201 WD engines have a plate bolted to the right side of the block (behind the mag/dist. and oil filter). The 226 WD45 engines DO NOT have this plate they are a solid casting on the right side of the block.
Hope this helps.