Re: Max Bore
The block you have is more than likely a good block with potential. Usually the 105's have the extra webbing in the block. You could probably go 100 thousandths over bore and still be safe. If you can get it sonic tested, then you'll know for sure.
There was an article in a ford magazine, someone had taken a 352 @ 4.00 bore and bored the chambers to a 428 @ 4.13. That's an hundred and thirty thousandths over.
Your block is either a 360 or 390 which is at 4.05 bore. (the difference is the crank stroke).
So depending on what your looking for.....
Here is the formula for caulculating what engine size you want.
bore X bore X stroke X .07854 X 8 (#of cyl.)
example: 4.05 X 4.05 X 3.78 X .07854 X 8 = 389.5 (390cid)