[Five0]

I run aluminum canfield heads for almost 2 years now and I have had no problems yet.
I would only run a iron head if you are getting a great deal on them. The iron heads will build a little more power but the difference in weight will offset the little difference in power you will gain and if you have a little more power in the front of the car and more weight, what do you think that is going to do for your traction. You can also run more timing in an aluminum headed car and have less chance of detonation and possible engine damage.

And also you can repair an aluminum head pretty cheap.

When I blew up my 302 and messed up 1 of my heads (a valve met a piston and put a hole in the bottom of the head) it only cost me 300 dollars to have it fixed and I had them ported at the same time so he just gave me 300 dollars off the price of porting them. If you look at where the damage was you cannot even tell it was ever damaged. If you mess up an iron head you might as well buy a new one.

Both heads have advantages and disadvantages but the advantages of an aluminum far out weigh the advantages of an iron head. JMO