[joebuick]

Hey Guy,,, Those are some good numbers for those heads. What is price? Good valve sizes. Do they have the newer heart shape chamber design? The 74 Cc is the combustion chamber size and with your flattop pistons, will get you in the 9.0 range on compression ratio. This will allow you to use regular pump gas,,,,, but is going to keep the HP numbers down somehat. You can contact the Mfgr of the pistons and they will tell you what the CR will be with the chamber design Vs your pistons design. ( Higher compression ratio = Higher HP) (Higher Cr also means you will HAVE to run premium gas or your engine will have detonation which can destroy it,,!!) I think if you wind up with 10.0 -1 you should be OK if you keep the RPMs up and don't lug it around. The .600 number is telling you the springs will work with .600 total lift cams. Keep in mind the lift numbers most Mfgrs use are .050 off the lobe so you can add that back and see what your total lift will be. Your rocker arm ratio ( 1.5 or 1.6 for SBC) will also be a factor in the total lift numbers. Try to score some roller rockers or at least some roller tip rockers to help your valve train at higher RPMs. OOps forgot to ask, is this a solid or hydraulic lifter cam?
Stay after it and you are gonna have a wicked, nasty chevy to wow the troops.