Car and engine specs as follows. 1974 318 with Performer intake, 1406 carb, 204 214 278 288 .421 .444 112LS cam, factory 318 manifolds into duals. Short block and heads are 1974 stock original. Trans is a 904 with factory stall and rear has 2.76 gears. Idle timing is currently 11 initial at...