bbc, big/small hump question

[70stroker]

My truck is a 70 gmc originally came wiht a 400/400 combo. It had a 350/350 combo when i got it. Now i just got done building my bbc and i am going to put it in this weekend. my question is will i have problems with the hump on the floor or something. I have heard different things on this.

also are the motor mounts different between the bbc and sbc. The small block ones will bolt on ok. just wondering.

thanks for any and all input.