Doesn't matter what any of us would do, does it do what you want it to? I have a stock 318 in my Coronet 500. I could give a rats *** about the comments that it needs a 440. For what I want it for I love the 318. The next question is how do you drive it? If you don't wind the crap out it why change the heads? I have Toth heads on the daughters Duster (more for cooling and no spark knock so she does not have to worry about those things) and if I wind them past 4000 RPM the Duster keeps pulling for sure but how many times have I taken them past 4000 RPM in either car? Once each... to do this comparison. If it puts a smile on your face everytime you drive it then it is perfect.