If it were me, I would replace the head studs, then just have the heads checked to make sure they are flat and no damage. Then put OEM gaskets back on and put it back together. There are plenty of vf52 E85 cars running around on stock motors. Your head gasket failure might not be related to your mods. It could have been compromised long ago if you had issues with air in your cooling system. Then as time goes by the issue degrades.
Cliff Notes: Spend as little as possible and don't just throw parts at it because you can.