It sounds like coolent isn't flowing through the heater core. Even if your car only reaches 140deg it should be warm, or atleast feel a difference from cold start up. If it worked befor the motor swap chances are that you did something wrong.
To change the subject... in your sig you say "don do burnouts in reverse because it is expensive" I can agree with that from experience 
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79 Hatch: NA 347, Stage 2 Canfield Heads, Victor JR. Intake, Blueprinted Holley 750 HP, Solid Roller Cam, Shooting for 10's on motor
93 LX: Tremec, dual friction clutch, fms flywheel, Hedman shorties, O/R H-pipe
Ricer hater's club member #49
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