Pat, Im sure Henry just simply forgot that you are THE big block guy here Henry, now say you're sorry!!!

Indmachrep (what's ur name?), I dont think 10/1 is too much for the street, Im at 10/1 with no detonation problems. But people sometimes think that if 10/1 is good, they will make it 10.7/1...so I said 9.5. 10 is fine, others might disagree. You have to pay attention to what your dynamic c/r is when you know your whole combo, all the specs and measurements and all. After you decide what c/r you want, build and machine your block to that end. Make sure you know exactly what all the measurements are, cause you will need them to pick a cam. Make sure you cc the heads, or have that done for you. Dont guess at any of this, for it all makes a difference in your final outcome. I always pick my cam last, when I know what all the other stuff comes out to. As far as heads, Im only familiar with the mid to late 60's, up to the 80's heads...that's the ones I have worked with. As I said, the 781's are one of the best flowing 'as cast' head that GM has made. They were made for several years. The 049's are basically the same casting, but they were only made one year. Im not saying these are the only good ones, but they are the most popular. Pat is right on about the peanut ports, they can be made to work, but it's easier to just start with a head that's more performance oriented. Well, to me it is anyway. I use GM iron heads, 3964291..they are rect. port, closed chamber heads. I had them milled to 100cc chambers, and with flat top pistons, .005 deck, and 4.351 bore, Im right at 10/1. There is a lot of controversy and arguments about using rect. ports vs oval port heads...some say you cannot run rect. ports on a street car. I can prove that theory wrong, however I also have more cubes to support the larger intake runners. But the oval ports that you're talking about will work great for your combo. John