Suped up...NO special build....YES.
On my 60 I have a 283 (67 block) with 350 heads with an early 90s serpentine belt set up... I did not build my truck as a performer but a cruiser. I have had 283s on my last 2 trucks and all I can say is I like them very much and they are undestructable imo. It performs very well especially with a 700r4 behind it..
Here sum old pics when I installed the engine.