I have been looking all over the charts but not able to find the size for a 2.3 whipple with a 3.5 upper, stock lower, 3" alternator pulley and the metco 4 piece idler set (90 mm and 3 100MM)
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78 was the length i calculated just seemed bigI have a Whipple 2.3, 3.0” upper pulley, stock lower, 3.0” alternator pulley, 3 - 90mm idlers and 100mm aux snub idler. Running a Gates K080765 which is 77”. I would grab a few belts and try them. I’d think it’s anywhere from 78” to 79” for you
Only way to find out is test fit it on or use the string method and measure the string78 was the length i calculated just seemed big