Brothers Chevy & GMC Classic Truck Parts : 1947-87 Original & Custom Classic Chevrolet & GMC Trucks

This is only one of many here in the States; google "1955 Chevrolet Truck Parts", and shop til you drop.

Also look into Summitt Racing.com, JEGS, Speedway Auto Parts, Edelbrock, and others for various parts not necessarily model specific, and for performance engine parts.

As to the "gearbox", it all depends on what your preference is in transmissions: automatic, or manual (standard), and the state of the build of your 454. GOOGLE is your friend; just search any question that comes to mind, and spend some time reading and researching - there is a wealth of info out there, and if I can find it, computer challenged as I am, anyone can.

Good luck.

.