Speedpro H405 pistons, what to expect for performance?

I had it bored for the. 40 pistons. Currently I have the standard felpro that comes in the kits. Just trying to get an idea if it's worth buying the thinner mopar performance gasket or mr gasket. I am just going to stick with the H405 pistons and continue with my restoration and play with it for a few years. So is it worth it to buy the thinner gasket? I know now I will not reach my goal of being in the 9's for compression without investing more money. With 4 kids I can't see being able to sink a bunch more into the engine without post ponning the completion for a while.

its maybe about 200 to mill the heads...