225 slant rebuild for more power

I’m 17 years old and taking auto classes through my school. Tomorrow we’re pulling the 225 slant out of my 64 valiant wagon. I need some more power out of it and don’t really know where to start. Going to see how much it will be to send it out to the machine shop but would rather not go through that. I’m thinking the 2 barrel manifolds and carb if I can find those and some new valve seats and what not. It runs good how it is but need to do all the gaskets and manifolds anyways got leaks everywhere. Looking for your guys recipe for a more powerful slant that is still a good runner. I’m located in LA if u guys know any machine shops in so cal.