i generally recommend large case 65 series batteries with lower cca 750 works pretty good, my reasoning is that there will be fewer plates spread farther apart and more acid allowing the battery to live longer before the plates sulphate and short together. in our shop we generally see a 5-8 year life span from a set of motorcraft 750s (bxt-65-750) $109.95, in the past few years motorcraft batteries have been built in mexico and quality levels went down. so we tried east penn batteries (deka, napa, reasource) but saw a higher failure rate, interstate was ok, exide $89.95 and motorcraft plus(BXL65)$89.95 was best bang for the buck. now the next variable is warranty, most all battery companies got rid of prorating system except for motorcraft, so choose your poison. also i recommend felt washers under cables on the posts and insulating blankets around the battery case for longitivity. consider a battery tender or Ctek charger and avoid deep battery drains