You could always get the 1" "add-a-leaf", which is just a block that the spring pack bolt goes through and then put a 2" block underneath it.
OR...you could put in a 2" block and switch to a soft top
OR...you could stack a 2" block with a 1" block, but you would probably want to drill them out and get a long allen head bolt to bolt them both together with the spring pack. If you do take your spring pack apart, be sure to clamp it together first with C clamps.
OR...you could get a 2" add-a-leaf and a 1" block
OR...you could cut the top inch off a 4" block and put a new hole in it. I think it's 9/16". This would also allow you to get the exact taper you want, but would be a PITA.
But sorry, I don't know of anyone selling a 3" block.
<font color=green>"Do not replace belt while engine is running" --Warning on a Kelly Srpingfield package</font color=green>