SB to BB swap

No not at all do you have to change the K-member.
You may need to modify & buy mounts.
If you have a 6 cylinder the driver side mount needs cut to fit the oil pump spring.
I was going that route but now I'm running an engine plate. I have a picture if you'd like of a modified mount.
Sorry it says I don't have enough memory to send a photo & don't know how to fix that.