$600 to $800 for the parts... lets see:

Headset, correct vintage used $100. min.
front der. cable stop type $150. to $225. (bronze arm, screw on pivots)
#624 cable guide at BB $60 (cable stop LH, tube guide RH)
NOS campy bolts for cable clamps $15.
Pre Record hubs and skewers, $150 to $250.
Spokes, chrome plated Unions $30 per set or more.
Weinmann tubular rims or Schereens (special order option) $100 to $400.
Tires visually acceptable, $60. period correct $200.
Brooks Pro or B-17 saddle, near date range $100
Correct Campy seat post $100
AS seat binder bolt $60, (Good shape or poor refinished)
Dropout adjusters, $25. (correct metal end type, not reproductions)
Brakeset, $20 to $80 (might take two cheap sets to make up one happy set)
Bars and stem, $50 to $100. can go higher depending on the stem length.
Shift levers, $20 (eagle eye ebay watching, for correct period)
Shift cables and housing, $20, Campagnolo only.
Freewheel and chain, NOS $80 to $100.
BB and cranks used $80, expect to pay $80 to $130 for each chainring if NOS desired.
NOS cranks doubtful
BB set thin cups used good, $80.
Pedals, Campagnolo, small typography, with strap loops, $125. to $200.
Toe clips, Christophe, correct logo, $35, doubtful to find anything but used.
Straps $20, NOS

No labor costs in above, even at the low end it is well past $1200. And one will have to miss a few auctions to keep the budget sane.

I quickly detailed above as many friends' often forget that its the small parts that can creep up the total. Or you make a compromise(s) chainring bolts, dust caps... forgot about bar tape and the tool kit. And the rear mech!

Do remember one does it for the end result, not for profit, Above bike will be worth less than the sum of its parts.