You cannot put .30 over 390 pistons in a .30 over 352 block.352 block bored +0.030
Well sort of yes and sort of no. Yes, the crank will bolt into a 352 block, but no, it is not a swap because if you try to use the 352 pistons and rods the pistons are going to stick (way) out of the top of the block at TDC. Short of custom ($$$$) pistons I do not think you are going to find pistons to let you run a 390 crank in a bore smaller than a standard 390.390 crank - this is just straight swap right ?
Shorter too, I would not build a performance motor with 352/360 rods.390 rods - stronger than 352 rods ?
Yes, they are higher compression, see answers 1 and 2.390 car pistons +0.030 - these =are high compression right ?
I suggest you buy something else. I would advise a Lunati or Crower. You need 8-12 degrees more exhaust duration than intake duration for a normally aspirated application and stockish heads. For advice that is more specific, we need to know what your intentions are.comp cam - suggestions ?
You can search here and at the FE Forum by cam description and/or part number. We have discussed cams here a good bit and if you cannot find something about a cam for an FE on the FE Forum it is either very new or a horrendous FE cam.
On the block, I honestly suggest that you hold off on buying a block or pistons until you get the engine out and torn down. Pressure wash the bare block and knock the freeze plugs out and do the drill bit test. (You can find that by searching here and on the FE Forum). If that seems to indicate the block will take a standard 390 bore then proceed. Discuss it with your machine shop and if they can do a sonic check spend the money to verify your drill bit readings. Due to core variations and shifting during casting you might not be any better off with a 360/390 block.