Missed on this combo?
Sorry to hear the OP is having such a hard time with this build.
I'm with Ramm. How much power did it lose? Where did it lose it? Where the oil temps the same as the previous dyno session? I also agree with checking to make sure it's not eating it's self.
I've bought parts from Rod before and won't hesitate to buy again. Brett Miller is a sharp guy that knows how to make good power with small block Chryslers. When I was deciding on where I was going with my 434 build he and I spoke several times on the phone, his insight was very helpful and much appreciated. I have confidence in his abilities and respect his opinions.
IMO there is more going on here than the heads.