pistons, heads, both?

I think the Erson is a 292/.449 with 214° @ .050 on a 112 LSA. It's not a bad cam if that's what was used. They don't have the larger 292s with 240+ @ .050 type profiles. I think if it was me I'd either leave it as it is, and plan to upgrade (rebuild) the thing in the future, or do the rebuild now and expect to re-use the rods, crank, block, heads, and tin. You need pistons to get any real compression, and with them comes the "might as wells" that will end up making you rebuild it anyway... Just my $.02