Shaker base plate

How can you tell the differance between a 340,383 and 440 E-body shaker base plate? Thanks.

340 has 2 tabs on front, facing forward to bolt straps to head, 383 has a single hole in middle that bolts to intake gasket center rail bolt. 440-6 has 2 tabs facing out towards inner fenders for tabs that rest on valve cover. Do a search, was just a great topic on here with pics and all measurements,

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I restored a car with a 383 baseplate on a 440 engine. They had dropped the k frame with 3/4” blocks to make the hood shut! Had to buy a repop 440 plate. Still have the oem 383 if that’s what you need.

Thanks for all the information,it really helped!