I'm a fan of cav turbos,
My old one
Cab able cars, very subtle, shame a lot of rep mobiles.
They are six speed, Will do 150+, transfer box is garbage but locking them is straight forward either with 5 cut to size cogs or bolts.
Red tops are great engines, suppose that's the cosworth guys influence as they were involved, origionally meant to be called the cavalier cosworth,, but ford pulled rank and blocked the name.
Jae