So far I have:
1. Dallara
2. Lola
3. Penske
4. Eagle
5. March
6. Ferrari
7. Lotus (Were the cars they ran at Indy in the 60s purpose built Indycars, or merely F1 cars set up for the oval?)
8. McLaren?
Anymore guys?
Plus, has any constructor built/run F1 and Indycar machinery in the same year?