Look at moovs for those 60/63s He has 579/658. I would imagine he could squeeze 600 hp out of em.
Not sure on the middle ones-maybe Millhouse knows.
With the IHIs at 11 psi, last time on the dyno I had 426/520 with GT40P heads.
97 Laser Red GT-248A Wingless model, Built Lincoln Mark VIII motor-Procharger D1SC, 3 core IC
2012 Black GT-Saddle, 3.73s, Brembos, Shaker1000