Yes, my mustang still with the 2V heads. Last year it made the #'s in the sig at 20psi. I just got done rebuilding the engine with new pistons. The pulls were only to check the a/f. I'm sure if I had turned it up to 20psi it would have made around 650rw. This was from last year with more timing and leaned out a bit.
http://i160.photobucket.com/albums/t165/y2k2gt/dyno%20graphs/eddie20psi.jpg