What is a 408???

408 is kind of a vague description of a small block la engine with a 4" crankshaft. The displacement will very with bore sizes but yes, a 408 has its stroke increased to move it from a 340/360 to over 400 ci.
Very good choices! How hard are you gonna hammer on your 360? Any serious racing or just street use?
more street then track. Maybe go to the Wednesday night drags at my local track but only to mess around