The 366 would be waht is called a Tall Block, it's a Truck engine. Not many folks seam to know there are Three main engines in the GM V8 family, the Small block, the Big block & the Tall block.

Don't know of many hot rod parts for it, it's a truck engine built for torque, not speed.

1965 GMC 3500 Rescue in the Stovebolt Gallery

My Facebook Links:
Jolly Goodfellow.
the 6066 GMC Guy.
Jolly's Truck & Car Show Page.
Owner of ~ 1965 GMC 3500 Custom Rescue Squad {Black Built Bodies}.