3461187 master cylinder for 71 Cuda. Work in a 70?

I have a master cylinder #3461187 which is listed as correct for 71-up Cudas. Do any of you brake guys know if this would work in a 70 Cuda?

If you have manual brakes then it must have the shallow groove part way inside the rear piston as opposed to a smooth tapered barrel like the inside of a thimble. If PB you're good either way