318 to 383 BB conversion for 71 dart

Hello, looking for advise on what is necessary to go from 318 to 383 and have K-frame motor mounts etc. bolt up correctly. Running 727 tourqueflite, 8 3/4 489 case with 3.91 gears. All rebuilt or new. Planning on running carb. with headers only. No major mods other than that. Any drive train advise is helpful including drive shaft length etc.

Thank you for any help!