318 Duster. high 14's. 2.76 gears (open), stock converter, stock exhaust manifolds, summit cam, home ported 318 heads and a 770 Holley. Thick .050 head gaskets so my compression is less than a factory 318.
Sounds about right. The OP won't go much faster. and all the speculation is just that, speculation.
The OP needs the previously mentioned parts to reach the 13's.
