Stroker options for the 4G63:
2.3 stroker- take the 100mm crank from the 2.4, put it in your 2.0 block with stock length 4g63 rods and stroker pistons with the pin moved up.

2.4 Hybrid- get a 4g64/g64b 2.4 liter, stock length 4g63 rods and 2.4 hybrid pistons, put a dohc head on the sucker. Transfer basically everything from the 2.0 to the 2.4, figure out something for the timing belt/ cam gears.

2.4 long rod- do the same as above, but get longer rods from Magnus Motorsports with 2.4 long rod pistons with the pin moved up, for a slightly better rod ratio.

2.1 high-rev stroker- get a 2.4 block, put the 88mm crank from the 2.0 in it, put some really long rods from Magnus in it with 2.4 pistons (they may be custom for the 2.1, I'm not sure), rev the sucker to the moon. Bottom end is probably good for 11k+ at this point.