"If" Scat is still selling Windsor cranks for Cleveland applications then the answer is yes you will need an assortment of specialized parts for that application.
If memory is correct, I believe Scat now manufacturers Cleveland specific cranks to Cleveland dimensions.
If the crank has a Windsor "snout" then you will need:
Specialized camshaft timing set
Crankgear spacer
Windsor harmonic balancer
My advice is to buy a "kit" from MME, Mark McKeown will assemble a kit that will have all the right parts. Mark uses specialized pistons designed by him for this application, featuring an off-set wrist pin to reduce thrust forces on the cylinder wall. Highly recommended. You get a superior kit, one stop shopping, assurance you are getting the right parts from somebody who has built many 408 Clevelands.
cowboy from hell
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.