Tire size recommendation

Hey guys. My Dad’s got a 72 duster 340. We are getting ready to buy some new rubber as well. It currently has 245\60-14 all the way around. All though these are wide enough I’d like to go bigger (taller) in the rear and a little more narrow and shorter in the front. Everything is stock, including the 14” rally wheels. I’m not sure of the back spacing on these stock rally’s...and any more information that you may need to know...please ask. Thanks for the help! Pic to follow
You have 245/60 r14s on a stock 14x5.5 ralley?