Trick Flow sells their 365 Chevy head for $1900 each and their dyno sheet for those heads shows 1071 hp. The BB Mopar 270 head is cheaper at $1400 but the 270 head only makes around 800 hp on a 13:1, solid roller, 505 bracket type engine. If there had been a steady supply of 4.500 bore Mopar blocks then there would probably be cylinder heads for Mopar engines that were optimized for the bigger bore size.

I've been helping some guys put together a BB Mopar that could make 1000 hp NA and it has been a struggle to find parts that will do it. It can be done but it costs a bunch more and it requires working with the right shop. If the Callies block is properly machined then that will be a big step forward. If the average machine shop can just finish hone it and assemble then that will be great. If it ends up being like some of the other stuff on the market then the average machine shop won't be able to make it right and that will put the Mopar guys behind even further.