360 pistons?

Personally I always like to check the end gap on anything I put together and if you have a ring file it doesn't take much time to set the gap. As for using the KB107's you have to remember they weigh a lot less than factory piston so the assembly will need balanced. The H116's are close to the factory pistons weight so you wouldn't have to balance it, although it's always a good idea since Ma Mopar's balancing wasn't all that great. Either the H116's or the KB107's are higher compression, generally in the high 9's with std. LA heads that haven't been cut much. If you want compression in the lower 9's the H405's are a better choice. Yes you don't need 4 valve relief's like they have but those valve relief's will lower the compression to where you want it.