The V4 Ford Cologne had some V6 siblings witch were a lot nicer. Among them the 2,9L from Scorpio Cosworth and the 4,0L from Ford Explorer. Both of theese have just over 200bhp and should bolt nicely into the Matra gearbox.
I did some googling and found out a V6 530 rally car was (partly) developed at some point using a 2,3 V6 Cologne