To my mind it looks like every one of the all-McLaren-orange race cars in this quick image search, perhaps '76 Rutherford is the last time an all-McLaren-Orange car ran the Indy 500? I have no idea,
@Dotini's usually the man for that kind of info
View attachment 645207
Team McLaren entries for the seventies:
'70, Carl Williams, McLaren-Offy, Orange/Blue (entered by Bruce McLaren Motor Racing) - 9th
'70, Peter Revson, McLaren-Offy, Orange/Blue (entered by Bruce McLaren Motor Racing) - 22nd
'71, Peter Revson, McLaren-Offy, Orange/Blue/White, 2nd
'72, Denis Hulme, McLaren-Offy, Orange/Blue/White - 17th
'72, Gordon Johncock, McLaren-Offy, Orange/White/Blue - 20th
'72, Peter Revson, McLaren-Offy, Orange/White/Blue - 31st
'73, Rutherford, McLaren-Offy, Orange/Blue/White - 9th
'73 Peter Revson, McLaren-Offy, Orange/Blue/White - 31st
'74, Rutherford, McLaren-Offy, Orange/Blue - 1st Place
'74, David Hobbs, McLaren-Offy, Black/White - 5th
'75, Rutherford, McLaren-Offy, Green/White/Orange - 2nd
'75, Lloyd Ruby, McLaren- Offy, White/Blue/Red- 32nd
'76, Rutherford, McLaren-Offy, Orange/Blue - 1st Place
'77, Rutherford, McLaren Cosworth, White/Blue/Red - 33rd
'78, Rutherford, McLaren-Cosworth, White/Blue/Red - 13th
'79, Rutherford, McLaren-Cosworth, White/Blue/Red - 18th
('80, Rutherford, Chaparral-Cosworth, Yellow/Red/Black - 1st Place)
Edit:
The seventies saw the first 200 mph lap. Tom "The Gas Man" Sneva qualified at 202.156, 1978, Penske-Cosworth.