[Aerkuld]

I agree with TimT. It isn't difficult to get new bushings made and I would think that you'd be better off doing that. You wont need the spiral groove as, when under pressure, the pump will force sufficient oil through those bushes to provide lubrication.
Incidentally, with new bushings I would advise you to get the bushing machined with slight interference in the oil pump bore and leave the bore in the bushing under size by a couple of thousanths, insert the bushing to the oil pump by heating the pump and cooling the bushing, and then finish boring the bushing to the correct size with it in place in the pump. You sound as though you know what you're doing so you probably know this, but if you do want any more information on this, post or PM me for help with sizing/tolerances etc.