[your ftb folder]\Regrowth\minecraft\config\microblocks.cfg there's an explanation at the top of the config, as for the server side, you'll have to contact the server admin to check if he could add the vanilla blocks to the config.
Here is the config at the server for multiblocks. There has been no modifcations to the file. i only see references to chisel. Is this correct.
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#Configuration file for adding microblock materials for aesthetic blocks added by mods
#Each line needs to be of the form <name>:<meta>
#<name> is the unlocalised name or registry key of the block/item enclosed in quotes. NEI can help you find these
#<meta> may be ommitted, in which case it defaults to 0, otherwise it can be a number, a comma separated list of numbers, or a dash separated range
#Ex. "dirt" "minecraft
lanks":3 "iron_ore":1,2,3,5 "ThermalFoundation:Storage":0-15
"chisel:chisel.marble":0-15
"chisel:chisel.marblePillar":0-15
"chisel:chisel.limestone":0-15
"chisel:chisel.cobblestone":1-15
"chisel:chisel.glass":1-15
"chisel:chisel.sandstone":3-15
"chisel:tile.snakestoneSand":1,13
"chisel:chisel.sandstoneScribbles":0-15
"chisel:chisel.concrete":0-10
"chisel:chisel.iron":1-15
"chisel:chisel.gold":1-14
"chisel:chisel.diamond":1-12
"chisel:chisel.lightstone":1-15
"chisel:chisel.lapis":1-8
"chisel:chisel.emerald":1-11
"chissel:chisel.netherBrick":1-15
"chisel:chisel.hellrock":1-14
"chisel:chisel.stoneMoss":1-15
"chisel:chisel.stoneBrick":4-15
"chisel:tile.snakestoneStone":1,13
"chisel:chisel.blockDirt":0-12
"chisel:chisel.ice":1-15
"chisel:chisel.icePillar":0-15
"chisel:chisel.wood-oak":1-15
"chisel:chisel.wood-spruce":1-15
"chisel:chisel.wood-birch":1-15
"chisel:chisel.wood-jungle":1-15
"chisel:chisel.wood-acacia":1-15
"chisel:chisel.wood-dark-oak":1-15
"chisel:chisel.obsidian":1-15
"chisel:tile.obsidianSnakestone":1,13
"chisel:chisel.blockRedstone":1-15
"chisel:chisel.blockHolystone":0-13
"chisel:chisel.blockLavastone":0-6
"chisel:chisel.blockFft":0-15
"chisel:chisel.blockCarpet":0-15
"chisel:chisel.blockBookshelf":1-8
"chisel:chisel.blockTyrian":0-15
"chisel:chisel.blockTemple":0-15
"chisel:chisel.blockTempleMossy":0-15
"chisel:chisel.blockFactory":0-15
"chisel:chisel.chisel.stainedGlassWhite":0-3
"chisel:chisel.chisel.stainedGlassOrange":0-3
"chisel:chisel.chisel.stainedGlassMagenta":0-3
"chisel:chisel.chisel.stainedGlassLightBlue":0-3
"chisel:chisel.chisel.stainedGlassYellow":0-3
"chisel:chisel.chisel.stainedGlassLime":0-3
"chisel:chisel.chisel.stainedGlassPink":0-3
"chisel:chisel.chisel.stainedGlassGray":0-3
"chisel:chisel.chisel.stainedGlassLightGray":0-3
"chisel:chisel.chisel.stainedGlassCyan":0-3
"chisel:chisel.chisel.stainedGlassPurple":0-3
"chisel:chisel.chisel.stainedGlassBlue":0-3
"chisel:chisel.chisel.stainedGlassBrown":0-3
"chisel:chisel.chisel.stainedGlassGreen":0-3
"chisel:chisel.chisel.stainedGlassRed":0-3
"chisel:chisel.chisel.stainedGlassBlack":0-3
"chisel:chisel.blockWoolenClay":0-15
"chisel:chisel.blockLaboratory":0-15
"Mariculture:limestone":0-10