Am i able to just cap the lines coming from the water pump to the heater core?...would that affect anything?

Blocking off can be done, but an easer way would be to loop from outlet to inlet at water pump with a short length of hose.

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67' Dart GT Convertible; the old Chrysler Corp.
82' LeBaron Convertible; the new Chrysler Corp
07' 300 C AWD; Now by Fiat, the old new Chrysler LLC

F/M/J-bodies (and possibly others) with A/C, came equipped with a shut-off valve on the hose going into the heater element, that redirected the hot water back into the other hose.

Olaf

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Aspenized