Well you should get some cash out of it. Nice std bore 390 block get at least $200. $75-100 for the 390 crank. Good set of rods maybe $60. Heads maybe $100+ depending which they are. Cast iron intakes $30 maybe. Timing cover, valve covers, pulleys and other odd and ends add up too You should be able to get something back out of it. I'd try that before you just scrap everything.