You could get mor hp out of just port and polidhing the heads cant you? plus Ive seen cam sets going for 200 bucks thats adverage.. I dont see where its anymore or less just because its a modular engine.. they might be Rare but Thats what makes it fun??? I had a 350 in a chevelle with 500 horses and it cost no more than it would to make a 4.6 do the same thing. Ford made the cammer which is a bored over and stroked 4.6 to 5.0 with only stroking and head work and there pushing 550hp and thats complete create engine..so to do it yourself your looking at half the cost...so my question is why cant it me done???