I have an aluminum set of L98 heads I would sell!
I would say Eldelbrock though.
If you decide to go vortec, watch this video. It shows what is needed to make the votecs preform. I am sure you are already aware of the issues with running a decent sized cam on a stock cast vortec head.
https://www.youtube.com/watch?v=Fbd33oEyCbU&t=569s
Good luck with the motor. Sounds like it will be pretty healthy when you get done!