ok guys an gals ...i pulled my old 3.0 out an put in a used complete motor ....i used my manifold,riser,carb an distributor motor starts an runs ...but i have rough idle ...i plan to replace points, cond , an cap this week end ...i sprayed around manifold an base of carb for leaks an didnt find anything ...tach isnt reading right but soon as i give lil gas it smooths right out an runs great ...carb was rebuilt by some one else right before i got the boat ...old motor had cracked block an blown head gasket (water in oil) anyone got any ideas ...i put new plugs in autolites are only thing i could get on sunday an im not real big on them so gona try an find more this week end....