I was browsing for a Maserati 300S to use on the Millie Miglia and came across Geroge Turner’s website. He makes resin kits that include body, chassis, clear parts, decals and photo etched parts. On some of the models, you can remove the hood and find a replica motor.
I ended up getting the Lancia 24D as it already had the correct Mille Miglia numbers.