If yours is a 063 it is a ROUND post type, so the one I suggested is no good as Ford terminal(flat).
That being the case your battery 063 will be around, 44AH, 360CCA
the next one up is the 075 at 60AH and 525 CCA, then 096 at 72AH and 680 CCA.
AH being amps per hour(energy density) the CCA is cold cranking amps, so the higher the number the more amps available for cranking.
A AGM type can be around 50% up on the 096 for the same size, but these are really suited to cars left long periods as self discharge is so low, normal battery is around 1% per day, AGM is less than 1% per week self discharge.
Sorry about the confusion I thought yours had a Ford type terminal battery.
tabetha