Heads up to all - Installed new injectors and fuel regulator in Betty, '96 4.0 69K, less than five hours run time later engine seized solid. The new fuel regulator was allowing fuel to pass, actually to be pumped, through its' vacuum line into the plenum. Checking the oil level it had doubled above the full mark from the additional petrol. I suppose just because a part is new don't expect it to be without fault. Engine still needs to be pulled and torn down but suspect the fuel at such a level in the sump washed the bearings and crank clean. I'll consider it good fortune If all that is needed is a crank and bearings.