no, no Tahoe . . no way to use the original A4000D 145 Watt PSU.
Too much drain.
I have 2 SCSI (a 10000 and a 7200) and an IDE+CD+CDRW more some Zorro cards and 2 GFX cards and i'm starting to have troubles with a 250Watt ATX (purchased brand new-Seasonic SS250)
Don't buy cheap PSU, above all with your nice configuration :-)