Opinions on running 35s with tbi 454/th400?

[Wellgeo03]

Looking at ordering a lift and some new tires for my new crew. I would like to run a set of 35s. It has 3.73 gears with a G80 in the rear.

It currently has the stock size 235s on it and the power is just OK. How badly will the 35s hurt the power?

I am currently torn between a 4" and a 6" lift for it. On my other crew, (86 custom deluxe) I figured a 4" would be fine to run 35s, as I am running 33s on it right now at stock height with no problems. This new crew (90 sliverado) sits almost exactly 1 inch lower than my 86 both front and rear even though both have the same GVW rating and spring count. The 86 is a 350/sm465, the 90 is the 454/th400.

What would you recommend?