engine swap 72 custom camper

[torino]

Hello, I am new to the forum...I have a 72 GMC 3/4 T custom camper. The original 402 ci engine is Kaput, I have a chance to pick up a good running Olds 455 from a 74 delta 88 c/w trans. Also still have the T400 from my truck. Can someone help to say if the 455 will bolt in where the 402 came out? Can the original mounts be used? I know the exhausts wont fit and the accesories will be different and I can deal with that but Im not interested in doing custom frame work Any advice is much appreciated. Thanks

Rick