i have a 86 f150 351w ho,im having endless carb problems, so i bought a new holly/ holly part num. 0-80457s, not exactly like stock holly but as close as it gets. what problems might be associated with this switch ? would i be better off rebiulding the old one ? i was also thinking about tearing out all the emission stuff while im at it. any answers or comments would be appreciated, thanks.