Well, after a comment from a gentleman, who was kind enough to point out a possible problem, along with a few email exchange with a tech at Vans, I have elected to re-order a 6061 T6 angle and re-do my 2 bottom longeron.
It is very hard to see on the first 2 pictures but the problem is that I did not twisted the longeron to have him follow exactly the engine brackets on the firewall. On the side, the match was perfect, but under the airplane belly, closer to the firewall a gap of 1/8" is there. So instead of having this doubt forever after, I decided to redo them. While waiting for them to show up, I installed my new JD Air tailwheel conversion I have decided to use.