frame brackets for Big block

[Bernie M]

Hi I am new to this Chevy truck thing, always wanted 60"s pickup , now I got one, picked up 1963 Chevy step side last summer, worked on new floor panels for a long time ,got that done. It had a 350 in it that is shot.
I need some one to clear up which frame brackets and motor mounts to use for a 396 Big block , I read so much here I am lost. I do not want to cut up the firewall to make it fit. And which frame holes did you use ?
Just wanted to be sure, because I do not want to waste alot of cash on parts that do not work.
Any help would be great ! Thanks to all that write. Bernie