Another thing to try might be to have a tank with cold water that circulates through the TB where the coolant lines went. Instead of hot water instead us cold.
1996 Federal hearse. CAI, Delphi 3.5 MAF, Aluminum elbow, airfoil, coolant bypass mod, 36lbs injectors, LE
223/231 110 LSA cam, Trickflow pushrods, Comp Cams rocker studs, Lunati 1.6 roller rockers,double spring kit and lifters, F-body heads, Cometic MLS .027 head gasket, Hooker headers, Cloyes timing chain, PowerBond balancer, EGR, air pump and AC delete. Solomon tune. CPT Pro-Race trans, 9.5 inch 3200 stall converter, 9.5 inch 14 bolt rear, 4.10 gear and TruTrac helix gear diff