I agree that the hood top louvers were too wide to "match" the narrower louvers on the deck lid and hood sides; glad you made the decision to change the louvers on the hood tops.
An easier way to go may have been to get the Archer Fine Transfers (brand) louvers. I haven't tried them yet, but I picked up a package and they look very, very interesting. They are kind of a 3-D decal with long rows of louvers that can be cut to length and applied water-slide style; they come in rows that are evenly spaced so you can apply up to eleven rows of louvers up to four inches of overall length (16 scale feet long); then you shoot primer and paint over them.
The set I have is Archer # AR88037, indicated as "Surface Details #37" O scale (1/48) 6" louvers ~~~ which translates to apprx 3" wide louvers in 1/24-1/25 scale. I've got to get a street rod build going so I can try them out.
I discovered the louvers while investigating Archer's resin rivet heads, Archer #AR88032. I had no idea the louvers existed until I found the Archer products in a model train store.
They also do tread plate and weld beads, among other items. Yes, they are pricey, but for the right project ....
Their catalog:
Archer Fine Transfers
Just some thoughts.