Picked up an 85 k30 crew cab dually recently and cant get mechanical fuel pump to work. Po had installed a inline electric guess he couldnt get it to work either.Part of the problem is I cant i.d. the engine. Its a big block but might be one of those truck motors( 366,427),would these tall deck motors have a diiferent style fuel pump than later big blocks? Maybe a different fuel pump rod length? Any help would be helpful thanx.