hey guy i did a 305 to 350 swap ...old style 350 with flat tappet with newer vortec heads with a intake gm aftermarket ....did put some 454 injector and 350 ecm...and so on ....motor runs pretty good ...just cannot figure where to set the timing ...can't put the timing set a 0 ....like it was in the 305 ....any idea ...with the wire not unplug the timing is set at 20 degree ......if i unplug the wire and set it at 0 the timing is way for back and the motor backfire and go no power at all ....thnx appreciated ...