Diesel Bombers - 7.3 non-turbo hp upgrades

HI I'M A NEW MEMBER FROM B.C. CANADA. I RECENTLEY PURCHASED A 1990 FORD F350 AMBULANCE AND MY PLANS ARE TO CHOP DOWN THE BACK TO MAKE A SLEEPER AND HAUL A 44 FT RACE CAR TRAILER WITH IT . IT CURRENTLY HAS A 7.3 LITRE NON TURBO WITH A 4SPD AUTO WITH AN AUX. OVERDRIVE UNIT {THIS VEHICLE WAS USED ON VANCOUVER ISLAND AND WAS A HWY UNIT.} WHEN I PURCHASED IT FROM GOVT. SURPLUS IT HAD A NEW TRANS, BRAKES ,TIRES, AND RADIATOR. } I BOUGHT IT FOR $1000.00 CDN {what a steal!!} OTHER UPGRADES PLANNED STACKS 4 OR 5 INCH, POSS. A SUPER DUTY FRONT AXLE ,AND WHEEL ADAPTERS FOR 19.5 OR 22.5 LOW PRO WHEELS. THIS UNIT HAS ONLY 174,000 KMS OR JUST OVER 100,000 MILES. IT WAS FLEET MAINTAINED WITH SERVICE EVERY 3000 KLMS. RUNS EXELLENT!!!!. ANY HELP ON INEXPENSIVE PERFORMANCE PRODUCTS WOULD BE HELPFUL WILL POST PICS AS PROECT PROGESSES. I ALSO OWN A 2005 FRIEGHTLINER M2 BUISSINESS CLASS TRACTOR WITH A MBE 4000 /450 HP MERCEDES /DETROIT DIESEL WHICH I USE TO HAUL A 6 CAR AUTO TRAILER. THANKS FOR ANY INPUT FRANK