You're gonna spend a lot of money making a 700-R4 hold up to a 454.It can be done though.
BTW,Turbo-400's were introduced in 1965 behind the 325hp,396(also new that year.It will hold up pretty good.
The best is the new 4L80 series transmissions.It holds up well and has overdrive for better fuel mileage.
I have all these and still prefer the Th-400.At this point in time the 400 is good enough and much cheaper if repairs are needed.
There are other choices too, but not as popular.
Mike.
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