Not sure if the SST stripes are the same as the ones on the Indy. Otherwise I would give you the dimensions off my grille and hood, since I still have the originals.
I painted my stripes on when I repainted the truck. It didnt cost much more in paint/labor. If your not going to re-paint the truck I would probably opt for the vinyl stripes.
Really cost is the factor, whats cheaper? It helps to know someone that can paint decently for cheap. Family member, friend, etc. Luckily for me, my cousin runs a paint shop in town.
Unless you have an incredibly low mileage, non modded truck, then I would definitely keep the vinyls on. Phoenix Graphics is pretty decent. Ive bought a few decals from them. My truck is modded and its got 140K miles, so I went with the painted stripes.
Whatever you do, good luck restoring!!
Just my 2 cents.