if you have to keep adding coolant then theres a leak somewhere, if you dont see it leaking externally, then you've either got a head gasket blown or intake gasket letting coolant into the lifter valley, by the way you described the oil, it sounds like theres coolant in it, check your dipstick and see if theres any trace of coolant in it, if you cant tell, just let a little out of the drain plug, this is what my car was doing, i kept thinking i was putting the intake on when it turned out to be my head gasket
good luck with yours
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88 Notchback 5.0, 3.73's, Explorer intake, pulleys, Crane 1.7's, BBK headers, off-road H-pipe, flowmasters, subframe connectors, 65mm TB, shift kit, March ram air kit, motorsport wires, MSD coil, upper and lower control arms, 155lph fuel pump, cheap 2800 stall, Crane Adj.FPR, best time- 13.99@99.75, not yet tested times after rocker and intake install