I'm keeping my eyes peeled for a turbo 3.8 to swap in place of an '84 Olds 307 and need some info on pricing. I found a carb turbo 3.8 out of an '84 Regal which is complete down to the plugs and wires. They want $500 for it and I don't know if that's a good deal for a carb motor or not. What do these motors generally go for in different conditions? Also would it be worth while to hold out and spend a little more on an sfi motor or would the carb version be a good enough upgrade to justify cleaning it up and swapping it in?