While NTFDAY is working on my desktop computer and tuning it up, I am laboring away on this POS laptop. I have worked for hours on giving you a proper response on this 454 that you are planning to build and have gotten close to posting twice now, only to have my response disappear into the cosmos somewhere. Maybe I can sneak a quicky in here. Wrong cam for 10.0:1. Needs intake duration 222 to 226. Wrong cam for hot rod BBC. They do not like flat tappet cams with increased spring pressure. Use a retrofit roller cam. Possibly wrong pistons depending on PISTON DECK HEIGHT. Have you measured the BLOCK DECK HEIGHT?