It may depend on which year B body spring you're wanting to use, pre 1964 B bodies used a shorter front half spring than the 1964 and later.
I think all the E body springs have a 22.0 inch long front half and they were mounted sideways in relation to the rear subframes, the front mounts are wider apart than the rear mounts are shruggy
I'm not sure if they will swap okay or not, sorry blush

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)