The 461 in my car now was previously a 400 w 16 heads and I ran Speed Pros at 9.5 compression. It ran great for 30k miles. That being said I am running Ross in the 467 and Mahle in the 461, both great. I would go for a quality forged lighter piston if I was you.
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Chris D
69 GTO Liberty Blue/dark blue
T400, 9" w 3.50s, 3905lbs
461, 850 Holley, T2, KRE 310s, Comp HR 236/242D .572/.594L, RA manifolds, 11.53@114, 1.55/60
The spare: 467, 850 Holley, T2, Edelbrock Dport 310cfm w RA manifolds, Howard HFT 245/251D .561/.594L, 11.59@ 114, 1.57/ 60'
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