carb seems to be giving out at high speeds

[Rich P]

Sounds like fuel filter but could be other things as well. Change the fuel filter(s) since it is a relatively simple thing to do and probably needs to be done anyway. Find the drian plug on the bottom of each carb and open them up (do not drop the plugs) to let whatever is in the float bowl out and then use the primer bulb to shoot a little clean gas through there. Replace plugs and when there is no more gas fumes take her for a spin. If problem persists, you might need to disassemble and clean the carbs, might have a coil that is malfunctioning when hot, or might have a fuel vent restriction. Good luck.
-Rich

[spareparts]

use the portable tank idea after you've eliminated the fual filter. If you use an old outboard tank, keep the primer bulb in line for testing, see if it acts up, the squeeze the bulb and see if it gets betetr. there is also a fule filter made onto teh fuel pump, its under the dome looking thing on the fuel pump, you'll see a screw thats safety wired in place, looses teh screw, remove the strap over teh dome, adn pull the filter out, Odds are, its never been replaced. If you need local help, I know several good shops around there. In case you haven't allready done it, I recomend replacing the points with a pertronix conversion kit, it will save you a lot of headaches