Have them checked out by a machine shop first. Unless you know the history back to day 1, there is still 21 years of unknown history. Could be warped, cracked, sunken valves and seats, guides etc... Ok for a show car that just wants oe parts, but the modern cylinder heads, like the Edelbrock are so much better stock, out of the box than any stock 40+year old head you will find. Unless the pushrods, lifters and rockers were marked when disassembled which cam lobe they were on when installed, they will be little more than just cores. If you can get someone to trade for a new set of Edelbrocks, go for it! Can't lose.