i have a 92 maxum scr with a reman. 350 vortec from marine power. i'm having problems timming it. its not t/b iv or a v. the distributor looks to be a gm unit. 2 wires comming from one side of the dist. to the coil and 1 wire from the other side of the dist. (white wire) going to the throttle linkage. looks to have a module like a gm under the the dist cap. the plugs are black and wet, running rich. timming is way off the marks. how do i put this in base timming ? any help would be greatly appreciated ...