The block looks like a 64-67 small journal 302 or 327 CID. Couldn't be a 350 I don't think.
Are your sure one of your heads is not a 3890462? I don't see 3890482 listed.
Are your sure the other one is not a 3891462? I don't see 3891492 listed.
Either one of those heads could be correct for a 64-67 327. The 3890462 sounds like more of a HP head. Do the casting symbols match each other?
