I have a 68 Firebird, 350, mild mods, 350TH, 3:08 open rear...have found a Camaro, 12 bolt posi, 4:10 gears, with axle. I want to mat this with a 200R4 tranny. I know the tranny is an easy swap, but what changes will there be in the rear swap?...btw, I have mono leaf springs. Thanx, Kel