small block fresh up

I dont know when the intake angles changed.. Was that 66 or 67? I would replace the heads with 302s and keep it simple. I dont think you'll hurt anything, and a stck done set of 302s will work better on a 273 than the original 273 heads will. I agree with not worrying abou headers... If you want to spend a little, my '66 Formula S used the 68-71 hi po 340 manifolds and they fit fine.