copo-rat,
When you pull the carb off that 67 nova 250, could you measure the throttle bore?
It should be either 1-9/16 or 1-3/4.
Just curious, assuming maybe it's the original carb (is there a tag on the carb?), if it is the "mid-size" BV or the "Big" BV carb.
The 230/155hp "HiPerf" in the 64 Chevelle ran the "Big" BV. The 194/120 and the 230/140 ran the "mid-size" BC/BV. Not sure what the 250/155hp ran though, maybe yours will tell us.
