In the right offense he could do well (2 bFBs). He will never get to the edge on outside running plays with less than 100 speed, though. If you are building him as an inside bFB / pass blocking FB it looks fine.
If he is to block on the outside that's just not enough... from the few TKW games I've watched this season, you need at least 110, preferably with FS. 100 speed will make you pull your hair out.
Was once told blocking FB's need around 120 to 135 speed at plateau (most likely enhanced by EQ/AEQ) to be really effective in outside runs. Enough speed to get to the first level of block needed to spring the HB. That was many seasons ago... may have changed a bit since then... but it's a good number to shoot for for a start.