Is there a significant advantage to changing the firing order of a 289 and using the 351w firing order? I've heard of power increases by doing this and wanted to better understand. I have a '65 289 to build, thinking maybe 331 and wanted to research inexpensive power increases. I had initially planned the Comp Cams 280magnum with about 10.5 compression. Using Edelbrock Performer RPM, Holley 570cfm Street Avenger, and Pertronix Billet distributor. It's a 4-speed car with 3.25 gear.