1 7/8" SB-Headers with column shift?

Hey Guys, anybody installed a set of 1 7/8" headers in a column shifted car? TTI says it´s a no go....don´t know if other (Hedmans?) will fit?

Car is a 1968 Valiant, small block, stock K-Member, manual steering, manual brakes - i´d like to keep the stock interior and column shifter.

Thanks in advance!

Michael