Massachusetts has been requiring twist lock and GFI ever since time began- (mine, '82 trade wise).

Then the big thing is- order motors without the cord.
1) you need a 12G insulated ground
2) you void the UL removing factory cord

Yep,I have had my fair share of -"Is that a #12 in that cord?"
Of coarse it wasn't..so.....

Why the heck do the MFGRS make them and install 14/3-4 cords!!!?