thanks everyone for your input. I am a die hard small block guy, but I got a very good deal on the big block.
These are open chamber heads, they were on a 468 with the same roller cam and went 9.40's at 2800 pounds in a chevelle.
I just was unsure of the smaller big block. If it runs mid 8's I would be very happy for what I have in it...
thank you all,
Josh