I'm sure some will tell you it is fine... But with such a strong compound like Boladrol I wouldn't want to stack two methyls... I am not a fan of stacking methyls in general. Also, being a pretty androgenic compound I wouldn't stack with a DHT based compound. I would go with something more anabolic. I would go with 6-8 weeks of a non-methyl stacked with 3-4 of bola. That new non methyl delta-2-androst-17-one is probably the strongest anabolic non-methyl out right now.
IMHO:
Delta-2 300/300/300/300/300/300
Boladrol ---/---/004/004/004/004
For something slightly stronger I would probably go with Pler's suggestion of M-LMG