I have a PTC but ultimate seems like great people too talked them a few times when I was getting converter quotes. Kenny at PTC runs a Yellow Valiant in 6.0 index. IIRC
67 Barracuda, 470" B, Glide, FuelTech FT600, Precision, Ptc, QA1, Calvert, Smith racecraft, Afco, Dana 60. 275 radials
