Yup, Agreed Andrew. Just finished doing 2 all aluminum 572CI / 750HP motors for Bill mitchell. Fricken awesome! One went in a 67 Chevelle, the other in a 57 Chevy.
Doing a 572 creates a few issues, Because of the long stroke, deep pan, and rasied deck, and the height of the intake needed to feed tha monster, the motors are very tall oil pan to carb
As for turboing, we can now spec out bill Mitchell low compression motors just for forced injection
You can see both projects we just finished here
http://gpsuperstore.com/forum/forumdisplay.php?f=15
And you are welcome to contact me to discuss the project