Reply to "351C block"

Most shops do not like to do a line bore on a block.
If the main caps are original to the block, that isn't necessary.
If you change the main caps then I can virtually guaranty it will need it.
That is a controversial procedure in my view.
You can get a situation where the caps are misalighed the wrong way and to correct this you are machining needed material off of the mating surfaces of the caps.
On overbore on a Cleveland block, I've seen .040 overbores with not much issue. It seems to be about the limit though.
Thin Clevelands can act like overbored FE's in that they will run much hotter and hot restarts can overburden the starter motors.
I haven't seen any sleeved Cleveland blocks yet but I don't see why you couldn't do 8 sleeves in one to bring it back to standard.
I personally would consider that as a very good alternative before I started paying for shipping on someone else's unknown problem block?
At some point the total work on a block will exceed the cost of an aftermarket racing block.
You have to look at that as well.