E-street vs Promaxx vs 440 Source

In your case, I would get your iron heads cleaned and inspected. This may make the decision process easier, if you find they're more work you want to deal with, you can sell the cores. But in also in my case, I've got a little bit of an unfair advantage with my local machinist/semi famous Mopar engine builder that make the Iron heads a no brainer... but being a borderline charity case doesn't hurt there, either! :D It may not be a bad idea to start scouring eBay and other places and find a set of secondhand aftermarket heads.