Never had a PTC , but I'll say if you got a good convertor from Coan and it's for a Torqueflite you are very lucky. Maybe they just like screwing local people. Sorry

E. Williams 65 Coronet 500 3400lbs w/d, 446, Indy EZ'S, A&A transbrake,Comp 650 lift cam, 6.50 @ 105 mph 1/8th 10.25 @ 130mph 1/4