Search Ebay for "283 crankshaft". There should be several listed. If the cylinders are badly worn or bored way oversize, the block can still be salvaged by sleeving them back to standard bore size. Pistons, connecting rods, and bearings are readily available, and just about any small block Chevy V8 camshaft will fit. A Comp Cams 252H cam is a very close match to original equipment, with no idle lope or other undesirable qualities.
Jerry

Just checked- - - - -there are at least 15 265/283 crankshafts listed on the first Ebay page I checked, both used and reground.
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!