i would STRONGLY recommend alot more rad that is a ton of heat, ideally 2 triples for that or a triple and double 120mm.
otherwise it's a great build you got going, i would however change out the cpu block for the current champ the EK Supreme HF.
as for the pump it will handle alot of stuff, i run 3 triple rads, 2 blocks, over 15 feet of tubing and one mcp655 can handle it all. but i do have 2 as i had 2 from before i built this loop.
another thought if you want to save some space would be to get XSPC's new res for the mcp655 which can hold the pump inside the bay's seen here.
XSPC Acrylic Dual 5.25” Reservoir