Warped components was an observed concern with me too when I tore apart my Rovan. Again my mini mill saved my butt. The POS composite Rovan carb spacer was twisted (air leak). And i was also disappointed in the DDM Dominator pipe as I was observing oil spooge exiting the exit flange. Come to find out the coupling flange was bowed convex big time from the factory welding operation. Again a few facing passes on my mini mill and the flange now seals as it should. So my point is don't assume that surfaces are "flat" , especially intake related components. Check them with a steel straight edged ruler or something and look up into the light to find any light gaps. Intake system air leaks will cause tuning headaches and you will think you have carb issues when in reality it's air leaks. I'll say it again, don't feel you have to use paper gaskets, there's nothing wrong with substituting Permatex RTV in place of paper. However that being said, there are circumstances where you DO in fact need to use a paper gasket ( such as your crankcase halves) to maintain proper component spacing.