Motor Swap

You need different mounts and or K frame depending on how you do it. Also, if it is a manual transmission, you will need a V8 bellhousing. If it is an automatic transmission, you will need a complete V8 transmission. Don't forget exhaust too. Yes, it's normal for the slant six to sit offset to the passenger's side. The V8 also sots offset to the passenger's side, just not quite as much.