Mine is just a 493 so its a tad under 500 cubes. I think most know about my street/strip build in my 63 as its run a best of 10.76 through the pipes on 92 pump driven to track. It did dip back in the 10.70's last year at 10.78 and 125 mph but it only runs in the 70's on good days. Usually runs 10.80's. But we are building a supercharged eng for my boys Dart Feets so you might like that one since it will be boosted. Hope to have it out by this summer if all goes well. Ron