In my opinion you just can't beat a Holley. Parts are cheap, they're easy to rebuild when the time comes and they work great. As for those two cams, they are both Comp Extreme Energy cams and both are on a 110 LSA. Which one to run depends on what you want to use the car for.
The XE262H (smaller cam) will make peak horsepower at around 5000 and have a 5500 rpm shift point. Peak torque should be around 3500. It will have a better idle than the larger XE274H and make about 20 lb/ft more torque. If you just want a good street car and are keeping the 3.50 gear this is the cam I'd choose.
The XE274H will make about 20 hp more than the XE262H but it will be at a higher (5500) rpm. Peak torgue should be around 4000 and the shift point would be 6000. This cam will have a more aggresive idle if that's what you're after. If this is the cam you want to run I'd switch to a 3.73 gear and also go with a Performer RPM intake instead of the Performer.
|