273 hop up help..manifold carb etc!

If you are going with cam swap the rule of thumb is a cam is gonna act 10-15 degrees larger in a 273 than 340/360 so a comp xe268H consider good performance street cam for a 340/360. So a xe256H would be it's equivalent for a 273. Don't forget about rear gears 273 needs all the help it can get in the bottom end department.