Re: 366 Engine?
dave, as always is right on. They make the 366 and a 427 tall block, truck block, marine block, which ever you choose to call it.
The 366 has very small bores, the 427 would be better with it's larger bore. They are all 4 bolt mains, and have steel cranks. The two share the same stroke of 3.76, not sure if I remember that number correctly but it is very close.
There is alot more parts available due to them becomming so popular with guys stroking them like dave mentioned. But the small bores of the 366 makes it a bad choice for even that. For the weight versus cubes you would be better off with a small block.
These engines also have govenored carbs to keep the rpms real low, like around 4500 max.
Find a 427T, install 4" 454 crank to make tall block 454, or install 4.25 crank for around 496 cubes.