BBC 772 heads Questions

[Puke160]

I got a good deal on a 427 tall deck out of a 83 c65. Now I'm doing a stock rebuild with a mild cam, But I can't seem to find any thing on the heads. But here is what's I have found after 6 months of searching. They are the standard large oval heads, with small valves, open chamber, and made for 68-86.

Does any one any one know the Combustion Chamber size? If they flow good with a set of standard size valves?

[Puke160]

It is staying a 427 but .010 to clean up the walls. and going in a 79 k25 with a sm465 and a np205.

Also how do they compare to 781 heads in stock form?

Intake Valve Lift 0.505
Exhaust Valve Lift 0.515
RPM Range 1000-5500
Intake Duration @ .006 (262 deg.) @.050 (218 deg.)
Exhaust Duration @ .006 (270 deg.) @.050 (226 deg.)
lobe Separation 111.0