I would go with the canfields.
You will lose a little low-end torque but will pick it back up high in the rpm's. That will help you get better traction because you wont be so likely to spin the tires so bad out of the hole.
And if you ever get more cubic inches or a blower or NOS, these heads really perform.
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James Cox
nochevy@hotmail.com
1991 Mustang LX
12.565 @109.38mph 1.764 60ft