Could you double check your numbers?
There were some 389xxxx block casting numbers according to various online lists, a couple for 250's and one for a 194. The closest I've found to 3894256 is 8994256, but that's for a 292.
The EAH suffix is a mystery, too. I have an extensive list of Chevy engine ID suffixes, and EAH does not appear on any inline 6 for cars thru '79 (the last year for a car inline) and trucks thru '83 (the penultimate year for truck inlines, excluding the 292's that continued on in certain trucks--I don't have '84 info). The closest is TAH, which is for a 250 from '73, '74, '78, or '80.
Someone on a Camaro forum posted an engine number with the EAH suffix, but his was a small block (327), and that suffix didn't "officially exist" for 327's either, though there was an EA.
