Aluminum, hands down.....not only do they seal better, but they get rid of heat better ! chrome holds the heat in, & will freakin fry the chit out of your knuckles when hot(big cuss words). crazyL 
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....
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