[Woodz428]

You asked about larger, but I'd say smaller with that combo. The 331engine that Clois mentioned has a better rod angle and has less thrust on the cylinder wall, which is pretty important in a stock block. The Boss block you mentioned is a good upgrade if you choose to stay at 347, however, in the crate engines that Ford will offer in that configuration they are only offering( at least initially)a 331 max size. It is supposed to be 500hp, if I recall. So while I do like the small block, I think durability will be less than with a 331.