500 was for the "high efficiency" 4 row. 400 if I used a 3 row, then the labor to do it in either configuration. I really didn't understand, as it just seemed crazy high to me either way. I think my new 4 row is in-line and not the high efficiency style, but honestly, I never had a problem with cooling capacity. For my end price, it would have been silly to re-core my old one.
1978 13BT-40, 70 series mechanicals
1966 FJ45 lwb stock
2003 100 OME lift
1974V8J40, 1992FJ80, 1985FJ60, 1971FJ55, 1978FJ40, 1974FJ40, 1997 LX450 all long gone.