Welcome to CHR. I think most on here will agree that the old 283 is not worth the time, effort and dollars you'll spend to bring it to life. Get yourself a later model roller lifter block at a minimum, to survive with today's low ZDDP oils, or like Mike says step into the LS series, like maybe a takeout package of engine, tranny, ecu and harness? Great power & driveability, and good efficiency, too.