They can be bored to 93mm, but it is apparently right on its limit then, while some blocks have seen hot spots in the bores at this size.
There is still a lot you can do to this engine, but it depends on how far to go and how much to spend.
My idea would be this, while working with what you've got, but would probably work out very expensive for the returns. In truth, you could probably pick up a ready built engine for what you'd have to spend. I'm guessing that if funds were not an issue, then you would already have done spent out on a Pre built lump.
Strong engine with good torque at 2128cc.
1600 diesel rods = S84FMB, bearings = B4635.
To build your block to 2128cc you need to do the following: Bore the block to 92mm pistons. 80mm offset grind crank with 1.6 Fiesta diesel Conrods. The diesel rods have to be machined by reducing their width to suit a Pinto piston at the small end and the narrower 2.0 Pinto journal at the big end.
The Pistons will need machining to take some material off the crown so that they are flush with the top of the block.
The crank, front pulley, flywheel and clutch assembly can also be dynamically balanced during this time. Flywheel can also be lightened too.
Get the cylinder head skimmed so you have 45cc combustion chambers. When fitted with a 1.5mm compressed gasket you will have a compression ratio roughly at 10.6:1
Cam wise, I would go for an FR30 on the road for good manners and torque spread.
This type of build will not give massive bhp figures, but will have a lot more grunt than a standard 93mm, 2.1 build due to the longer stroke and torque.
Fuel wise with money not an object, I would go with Jenvey Heritage Throttle Bodies that look exactly like carbs.
Honestly though, this is more of a "what if" build and would probably cost about £4k with the Throttle Bodies. You could also add another £750 for porting and valves to the head. By the time you've bought all the gaskets, oils, bolts, clutch, etc etc, you'd be close on £5k.
Probably get a full Zetec conversion fitted for that, which with the retro cam cover looks stunning to me and would probably be more power.
I know, I've been no help whatsoever, but it was a nice thought...