340 manifold vs TTI's which set-up?

Keith Mopar said
I say do the job once and go with the TTI's. Long tube headers should help bottom end, not hurt it. How ever, putting TTI's in an early A, is a lot of work, pulling T bars and steering colume. and dropping steering linkage. Putting in the stock 340 manifolds would be a lot EASIER.
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These will be going in my 70 318 Dart.

The guy I was talking to believed bottom end would suffer with the puny 318 heads,and the 340 manifolds would be ideal.