232 would work, but its ATSF & BNSF version, DS-230 would be better, as its a SP, CSX, NS version. I think its a Dash 9+ package, but seems to me it would be close enough to match a Dash 8.
DS-230 Detail Set contains the Following Parts:
Snow Plow (PL-233)
"Salem" Air Dryer Filters With Mounts & Pipes (AF-237)
Bell (BE-238)
Rear Recessed Sandfiller Housing & Hatches (SF-241)
Brake-Vent Regulator Valve (BV-245)
Handbrake Chain Pulley Beam (PB-246)
Emergency Fuel Shut-off Switch Box (EF-247)
Traction Motor Cable set (TC-239)
Which gives you the correct plow.
Some additional parts of interest:
MU-266 MU Hose, 3 Cluster Set, All Roads
AH-267 Air Hose, Locomotive Trainline With Barcket
FF-258 "GE" DASH 8,9 & AC4400CW Fuel Fillers & Gauges
MU-236 MU Cable With Double Ended Receptacles
DL-229 Ditch lights w/ lenses, pilot end mount "GE"
A-line:
29210 Diesel Cab Sunshades (6)
I can't quite tell but 7738 looks like the first of the following and 7664 the 2nd. If you find good roof shots, of just pick which one you want. Detail Associates has another square top dome coming soon thats probly the perfect match for the 2nd one.
Hi-tech details:
HTD-6007 Octagon Antenna Dome
Details West:
GP-320 Matic Co dome (not sure of the name, and I neglected to look it up again.)
Also I left out the horn, as I cannot tell.