well,i don't read the "bible",i just go with what works. i have built 3 different 400's,using the closed chamber 516's for cheap and easy compression bump. you already have them. your 400 has pistons anywhere from .090 to .115 in the hole. the 452's will keep it at about 7.6 to 1. the 516's will bring it to 9 to 1.
current one i have, 66 coronet 2-door sedan(3700 lbs.)77 400,stock bottom end,no decking,uncut,unported 516's,comp XE268,performer RPM,750 holley VS carb,cheapie summit headers,2400 converter,8 3/4 with 3.55's. car runs on 255/60/15 BFG drag radials, have atleast 50 time slips between 12.94-13.10 in the quarter.do the math. i'm just saying,the 516's work, pretty sure thats not in the "mopar bible",but,the time slips don't lie.......