I run the EZ-1 heads, and they have been awesome. At your weight, you will want better heads yet.

I have just switched to a 400/512 all the rest the same except light weight crank...Had an issue that has been holding it back. Gone 6.25 so far.
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Do you mind sharing what the issue was

71 demon stock stroke 440/indy ez-1 running 10.10 @ 132.14 mph in the 1/4 and 6.36 @ 107.46 mph in the 1/8 not in the same weekend but It did it then I sold it.
67 Belvedere that worked it's way in the 10's