Bruce,
I let my HW-8 go years ago to a would be Novice who never returned it. That was 20 years ago.
That RF choke will need to work 80-15m, so some experimentation might be needed. The schematic says 26 uh for RFC-3.
Maybe the JW Miller series carried by Mouser will do. The 27 uh choke there should work for 80-40m, but the self resonance frequency (SRF) is 7.6 Mhz, so as choke it is good up to the SRF, but beyond it looks more like a capacitor than an inductor. Maybe the 22uh in series with the 5.6 uh would do..
Good Luck,
Jim
WD5JKO
http://www.bourns.com/data/global/pdfs/77F_series.pdf