Intake manifold gaskets

[mgold97]

well, I swapped my old 305 for 350 few weeks back. New 350 had stock gm intake manifold , so I swapped my old edelbrock intake off my 305(which had 327 style) intake when I bought it. Replaced all intake gaskets and everything, but last week for my birthday I got brand new intake manifold which I wonna swap again, but was wondering if i should replace intake gaskets again( engine hasn't been started) or leave gaskets on and just replace an intake?

PS old edelbrock has warped thermostat base so in leaks.