Re: 400 in the 68 Chevy
Vortec heads will work fine on the 400 SB. You'll need to drill steam holes, but you can use the head gasket as a guide for those.
Your HP/torque goals should be easy with that combination. You'll need a manifold that fits the Vortec heads. Edelbrock makes a Performer for that application. A Quadrajet would be a great carb to have on that as well. The 400 is also externally balanced, so you'll need a different balancer/flex plate.
One thing about the 400 - make sure your cooling system is up to snuff.
You'll love the 400 in your truck.
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