Stay away from the E303 in a carbed application. My old man had a 302 Ranger with just about the EXACT same specs as the build you're planning and that stupid thing couldn't idle worth a squat. Lean surges plagued him the whole time. I would not use an EFI cam in a carbed setup. Either cam is a decent choice, and you'll hear this from everyone I'm sure, there are MUCH better cam choices out there. The alphabet FMS cams were the early ones on the scene, they have been surpassed by much better grinds.