Cheers Stevie and everyone else thats given input. The reason I was considering a single piece prop was mainly because my car doesn't have a centre mount in the a new tunnel and thats all painted any tidy
Anyhow after reading of the experiences of those that posted and that coupled with the issues I had with my Escort has convinced me that a split prop is the only way forward. I did make a bolt in bracket for the centre mount on my Escort and maybe that will work on the Firenza too.
I've decided that a Sierra Cos 2wd will do the job if I change the gearbox yoke and change the diff flange to Mustang 8.8 and then shorten the rear section at the front to the required length (cant shorten at the rear as its a tube in a tube with rubber insulation inbetween). It's at the prop place now so hopefully I will get it back by this weekend.