We use Eagle. Good stuff from my POV. We had issues balancing Scat SBC cranks, and it "spilled over" to their Pontiac casting. Had trouble with pins "walking" in Scat "press-fit" H-beams. None with Eagle in similar builds.
The late-to-the-party Pontiac forgings from Eagle are excellent. We've used several, and they're as nice or nicer than Eagle's BBC stuff. Local racer Bill King (track champ, '09, '11 and "runner up" '08,'12 at VMP "Sportsman" class) has an Eagle forging in his 406 SBC. 300-plus passes so far (mid-low 10s, 2,950 lbs) and no sign of issues. His racing "partner" Gerald Driver, jr. also has an Eagle in HIS 406 SBC (we built them both...). He's not won the championship yet, but has been in the top 3 each of the last three years. Short blocks haven't been touched.
I can't tell you how many boats are "out there" with Eagle 383 "kits" in them.
Sprint car? Gasoline? Carillo, Crower or Oliver. Alcohol or nitro? BME or R&R... Summit isn't exactly the best place to shop for a real race car.