[W126 Coupe] 420SEC with 3.27 Approx. 0 to 60 times??

[v2ooo at iinet.net.au]

I am putting a 88 model 420sel(Australian delivered) motor with NO CATS into my
83 380sec and was wondering what accel. times I would be looking at??? 

P.S.Car has a standard Aussie 3.27 diff.

Thanks

Theo