LD4B, excellent intake for 273/318. Taller than the Performer and has larger runner volume. LD-340 was its big brother and those go like hotcakes. Very good design, wide operational range, surpassed by Performer-RPM. May be similar to Stealth in performance, but probably cheaper because it is older. Used on early 340 drag cars before Ld340 came out.
Either way...it your choice...and with the economy the way it is..if you cant afford a new carb I would go the stock way...especially if you are a daily driver and the carb being good...ie rebuildable...my 2


"Liberty is meaningless where the right to utter one's thoughts and opinions has ceased to exist. That, of all rights, is the dread of tyrants. It is the right which they first of all strike down." Frederick Douglass