To point you in the right direction for that question we will have to talk about the rest of the motor, is it a 355 0r a 383 ? apart rom the mention of gearing and the lt1 intake dont know about the engine gearbox combination, you know all the basics static compression ratio's, carbureted or injected ? points or electronic dizzy ? auto or maual gearbox and type of car it's going into. This will bring into question hood clearance heights for the manifold being either a high or medium riser. Now after saying all that I notice you mentioned TPI there ???

I better say now I am old school and work with slosh bowls ( carburetors ) and am pretty basic about electronic fuel injection, Denny would be the man to see about TPI