It's a bit short ... I'd have suggested 70" as a minimum, but at 40# you may be ok, especially if you heat treat the belly.
The split ends could possibly been glued and clamped up as there is very little stress at the tips, especially if you fit horn nocks. Maybe something to bear in mind next time.
In fact you could always splice on an inch or so, especially as you have some matching wood. I've done it before now
Should make a nice looking bow... good luck
Del