Wouldnt replacing horizontal road drops with track ends lower the rear of the bike by a centemeter or so? On my road bikes, the dropouts tend to place the axle slightly lower than the chainstays. On most track frames I've seen, the track ends position the rear axle so that its ever-so-slightly above the chainstay, kind of centered between the chain and seat stays. I know it sounds confusing but if you look at the drop outs on a lugged road frame and the length and placement of the seatstays and chain stays, it might make more sense. Would this slight lowering of the rear affect anything? how about the bottom bracket clearance?