Need to know stat...m-body 8 1/4

would like to stay mopar,anyone know if it'll fit now??? 71' demon..has a 71' 7 1/4....i'm thinkin' it just might..just don't wanna drain $200...but it's $200 complete...but i'd have to redrill the axles and drums for teh SBP, and chop teh driveshaft