YOUR OLD 60 WILL PROBABLY FLY IT,BUT THATS ABOUT ALL IT WILL DO,I WOULD PERSONALLY OPT FOR AT LEAST A 65 TO A 82 SAITO,NOTE THAT 4 STROKE RC ENGINES HAVE MADE MAJOR LEAPS AND BOUNDS SINCE THE DAYS OF THE ENGINE YOU DESCRIBED ABOVE, AND NOTHING STINKS MORE THAN RAKING UP YOUR NEW ARF OR KIT BUILT MODEL FOR SOMETHING AS SENSELESS AS UNDER POWERING,OR UN RELIABLE OLD UNDER POWERED ENGINES,ESPECIALLY WITH ALL THE LOW BUCK,GOOD QUALITY ENGINES THAT ARE OFFERED TODAY,SUCH AS THE MAGNUM 4 STROKE LINE. SIMLE RULE OF THUMB,ITS SAITO OR NO GO