383 dart 4 speed

we got the dart up and running last wednesday and finaly got it all set up today. we had a small pinging problem because all we can get in are town for fuel is 91 octane we need more . I put c12 in today and the ping is gone but thats to exspensive so i am going to try some octane boost with 91 next time see how that works. the 383 is a 69 bored 30 with trw forged pistons 906 head 504 528 crane cam running around 11to a 11.5 so you see why fuel is a problem putting in the 383 sure made it alot more fun to drive.