What's the material for the frame? Generally something like .125 wall 2"x4" rectangular tubing will be a good 'backbone'. As far as cross members - take a look at what most builders supply for '32 Ford builds either in round or square tube. Then you need a front and rear cross member. Since I don't know what you are going to use it for, don't have a feel for any other cross member needs. Even a 3-400Hp 305cid Stude engine shouldn't twist that.