[b454rat]

I wouldn't go with the 366 heads, they are small ports, and will run like a bastard to about 3k RPM then fall flat on it's face. If you never plan on going over that RPM, then go with those heads. I'd go with the 781 or 049s. My old truck had a stock 454 with 781s, 4-speed, 4.10s with 35s, thing was a blast to drive. Had all kinds of power, and would pull to 5k.

With either of the heads that I mentioned, you have the ability to get more out of the motor down the road. Those 366 heads, they are just a waste of money doing anything to them.