I've got a 91 Caprice Classic with a 5.0 w/ TBI. What's the cheapest way to gain 25 or so horsepower? I've already got straightpipes. Also got a '85 Caprice Landau coupe with a 5.0 w/ a 4-barrel carb. Any tricks to get a little more out of that one? I know, I know, gas is expensive, but these are the closest I'll ever get to owning a muscle car... gotta work with what I got!