Det45....(Name?) Welcome to the site. What is the deck hgt on the block? That will affect your c/r quite a bit. Those heads, if they are not bowl blended and ported too much (in other words, if they are stock size chambers) are going to give you a pretty decent c/r. Chamber size should be a little less than 100cc's, maybe 98 or so. With flat tops ( are we talking stock flat tops, like a little dish in the center?) you still should be somewhere around 9.0 to 9.5/1. I would think HP might be around 400, and tq maybe a bit more, 450?? I'll run it thru DD later and see what comes up. What are the cam specs at .050? And what is the LSA....110 I assume? That should be a pretty good cam, Im not a big Crane fan, but they're pretty good. Post the rest of the numbers when you get a chance. What are you gonna use this for? Street mainly? What tranny and rear gears are you running? If auto, what stall? How big are the headers? (diam) Carb and intake are OK....Dont be swayed by 'bigger is better' in the carb area, this is plenty for your engine unless it's a race only, which is obviously isnt. Let us know more. Oh, and even though those heads are old design, (closed chamber), I have a friend who's running similar closed chambers, and he's in the 10's....WELL into the 10's. So they do work well. John