I don't have a dog in this fight, but one thing that hasn't been mentioned is the fuel system. I do not do carberated systems and haven't for years. but on any injection engine it doesn't take a dyno to tune, be it stacks, terminators, hat's ot blowers, it's all easier than tripping over a log. You never mentioned if it's alcohol engine or gas engine in your post :?: so i can't compare, i do have a few friends that run gas with b/blks that run 4.50's on gas none are 632's, mostly 572's, i also have friends that run 4.80's with small blks on alcohol @ 1800 lbs. It take 950 HP to run 4.60 @ 1800 lbs, but you never said what you wanted to run. If you had a Mopar alum. at 1800 lbs and it ran 4.64, you just added 100 lbs with the 632 steel blk. Like i said i don't have a dog in this fight, but no one i know has ever had an engine dyno'ed and we tune them our self at the track.
Now i do agree with you if Naylor said it will produse 1100 HP on a dyno, it should be dam close to those #'s, however i've never been in that situation, so i chose to not take sides.
JMO
Zip.