i beg to differ about the statement "440 is always large (except '78)"

the truth is that ANY big block that was originally equipped with the lockup version of the 727 transmission will have the SMALL flexplate. the rest of them will most likely have the large plate unless the flexplate and/or converter has been changed. the hemi engine i wont address, as you arent likely to see one of them. small block engines i wont guess at either, although all of them i have had (2 318's and 2 360's) had the large flexplates. when i needed a small flexplate, it was $10 at the local junkyard. it was already off the engine.