cheapest file fits you can find std tension oil ring and go!
Gapless rings are for DIRT cars that wear out fast and some alky applications where they keep alky out of the oil at idle--They will leak test better--They will NOT dyno test better in my experience also way more cash and you will get beat at the track by a guy that has three different pistons a flea market converter and drives like a pro
cheap house brand rings with proper wall finish work
low tension aok for dry sump --usually not with wet sump engines
after 20 runs std tension just as good as lows for what we do--
wall finish correct--Square gaps done with care--that is the hot lick