small block chevrolet in a 68 barracuda headers
Don't bother listening to most of these guys, half of them don't even know what they are talking about and I'm willing to bet half of them haven't lifted a wrench in their life. Go Chevy for all means, use either block huggers, S-10 swap headers, or stock truck manifolds. Your biggest issue is the steering sector.
By the way fellas, if Chrysler engines are so great why isn't the 318 the number one swap engine? Riddle me that!