63 engine/trans swap?

[70 net440]

I'm planning on replacing my 283/3sp column with a 350/350 column on my shortbed C-10. I have converted to power steering already. I have an auto column from a 67 will that work or should I look into an aftermarket column? My engine mount towers are in the rear position. I'd like to move them forward to get some dist. clearance. Will a short shaft 350 be the right length or will I need a longer or 2 piece drive shaft? I'd like to leave the parking brake cross member the way it is. I have a couple different factory crossmembers from 67 up trucks and one from a Nova. Would one of these work or should I fab one up? Also, what do you guys do for a neutral safety switch? Sorry for all the questions, I would like to have a good plan in place before I pull the old engine/trans out so I can do this job as quickly as possible. Thanks for any replies.