I poured mine, very slowly so as not to stall the engine, directly into the air intake (after removing the air filter housing of course). This will get into all the cylinders, if your engine has a similar CIS injection as mine. The brake booster vacuum line is a real bear to remove too (just follow the tecalon tubing from the booster canister to the manifold to find the inlet port)!
Lots of smoke, great show for the neighbors! Not really sure if Seafoam actually cleaned anything up, but it didn't hurt anything either.

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1986 560SL
2002 Toyota Camry
1993 Lexus