Why am I drawn to the aluminum??

One minor clarification. The Eddies equipped for a roller cam (part #61775) cost a little more. $840 from Summit so $1680 a pair. If we add $450 that's about $650 over RHS from Brian.

My initial idea was to have just a basic check on the Eddies by a local shop for under $100. Perhaps that would turn into more spent depending on how they check out.

Interesting to me that a valve job can have significant flow effects. I assumed it would be minor.

I have to agree with cracked, the Eddies at least in that pic don't look so hot. They might look better painted.

The more I think about this, the more I believe IMM heads are the way to go. I'll be confident in the final product with the hands on approach. Likely the springs and valves are better quality and he does a cc check on them. Plus I get his advice in putting things together. I've tried to educate myself but without much experience, that's valuable to me.

As is shown by the interest in this topic, it's a very important part of the project. The opinions from both sides are really helpful in making a fully informed choice so thanks again to all.