Sweet Bullitt. Really nice job. One of my favorite cars. I agree. Your dad should know to lose the badges. Afterall, it is a Bullitt. Just my opinion as a former Bullitt owner.
Regarding the badges, if anyone knows of some 3/4 scale 5.0 badges, we'll switch to those! It makes sense that they're the new style 5.0 badges since it's a Coyote and not the Pushrod 5.0. Also, while the old style badges would probably be a little smaller, the style just looks really 80's compared to the New Edge, if you know what I mean. Just my opinion.
Regarding the cost, I mentioned the engine/computer stuff above and I honestly don't know the total. That stuff is changing fast too, because of all the parts going into production to make the swap easier.