The weight issue is dead, it has bee proven wrong by many people, noone can argue the weight issue, I had an H, and its no different than a B as far as handling.

Upgrade your suspension, and you will never know the difference... If your friend said he would do a B, then I would do that. Its nice to have friends that know how to do what you want/need, Good luck with the swap, and let me know when u take out the D, I will want some parts off of it, if you are willing to sell them.