Get the wire brush out and double check your 394257. If it is actually 3994257, then it is a 67-72 250. The closiest I can come on the head is the last 4 digits 4437. If it 3824437 then the head is off a 63-66, 230, but you might want to double check that as well. Hope this helps.
Larry
68 C20 327/465 daily driver 4:56 och!
63 C20 292/420 Camper truck Detroit Locker 4:10 posi
65 C10 ? /powerglide Custom Cab AC,PB,PS,4xflasher
