I've just gotten a 45# longbow myself, and was looking up the arrows that would go with it.
Lets see, Francosis Squirra had an article in the 10/22/2008 editon in africanarcher.com. He says you need a momentum of 0.40 for Blue Wildebeest and Kudu.
I'm shooting ICS Bowhunter 500 arrows at 31". So, you may be different from that. With a 185 gr head, I'm pretty tuned, but only have a momentum of 0.37 (total weight is 441 grains).
If I go to an ICS Bowhunter 400 with a 250 grain head, I've got a 540 grain arrow. That's not bad: GPP is 11.65 and FOC is 22.6.
With the ICS Bowhunter 400, now my momentum is 0.41. This is sufficient for the animals you are hunting.
Last year, I shot a Blue Wildebeest with an arrow that had 0.47 momentum. I did not have a pass through. There was about 5" or 6" sticking out the far side. It was a slight quartering toward me shot.
Hope this helps. Your bow should work okay. Good luck... Only wish I could be there hunting Kudu with you.