Bent up stuff

Ive read the whole post here and I feel for you. When I did my 408 I bought a cam kit from Comp cams. I had all kinds of issues from the lifters, cam center circle and the springs. The engine builder had to be on the phone with them 3 times until we had something that worked. They ended up regrinding the cam for a smaller center circle, the lifters I couldnt use and the springs had to be changed to get the correct ones so I didnt have binding springs. Now maybe all my terms are not correct since I didnt do that work myself but there was only one person at comp that understood all the issues we ran into. Yes my was a .575 .575 solid roller which sounds very close to what you have. In the end I give Dave @ comp cams credit for all his help.
One question I have about your engine is you state in the first post that your motor was running perfect earlier in the day. How long had this motor been in and running? Was it just at initial startup or had you driven it for a while? Not that it mattered but was just curious.
Best of luck with your rework, As many have said I would pull it totally down and recheck everything again myself.
Rod