IIRC, '57 was the first year for the Ford 9" rear end, and also the first year for the Borg Warner T-10 four-speed gearbox.
EDIT: Yup. Checked. IRC.
If you go with a hemi, those would be my choices.
Any of the Revell '32 Fords have 9" rear ends that can be made to work with leaf springs (and will look fine under a 1/24 build), and most of the 1/24 Nascar kits have reinforced 9" rears. Though the sheetmetal reinforcement on the Nascar banjo housings wasn't a thing in '57, there's absolutely no reason somebody couldn't have done it.
This vintage AMT engine parts pack (below) has both a Chrysler Firepower hemi and a slightly-overscale (for 1/25) T-10...and a whole lotta other good stuff.
https://www.ebay.com/itm/326063448991
Only problem is that the hemi is blown...but somebody aftermarket sells a Hilborn injection setup for it, and there are kits with 2X4 manifolds that could be made to work too.