I am going to be building a "junk yard" engine. I need to get some machine work done to get the block even close to thining about turning over again

... I am goign to have 241heads and i was wondering the chamber size on these and this thing is going to be carburated with bottle

I have heard of people running the MS3 cam and having good results...? But has anyone had any luck with the MS4 or anything else? I would like to know If there are any other carb guys out there that would be willing to fill me in on some pointers or tips.