C150 PLT HAD AN NMAC ON FINAL AND A GND CONFLICT WITH SAME ACFT WHILE TAXIING.

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I HAD BEEN IN THE TFC PATTERN FOR ALMOST 1 HR WITH A STUDENT; PRACTICING TOUCH-AND-GO LNDGS. WE HAD BEEN MAKING RADIO CALLS ON EACH LEG OF THE PATTERN; PER STANDARD PROC. WE WERE ALSO HEARING CALLS FROM OTHER ACFT; INCLUDING THE OTHER ACFT INVOLVED; BUT VERY RARELY DID HE XMIT ANYTHING. AS WE TURNED ONTO FINAL FOR OUR LAST LNDG OF THE DAY; THE P51 CAME SWOOPING OVER THE TOP OF US; NO MORE THAN 100 FT AWAY. WE COULD HEAR HIS ENG NOISE OVER OUR OWN NOISE AND THE HEADSETS WE WERE WEARING. A FEW SECONDS AFTER HE FLEW OVER; WE ENCOUNTERED HIS WAKE TURB; WHICH RESULTED IN VIOLENT; SUDDEN BANKS OF AT LEAST 45 DEGS IN EACH DIRECTION; ALONG WITH NOSE DOWN PITCH CHANGES. AT NO TIME DID THE OTHER AIRPLANE CALL DOWNWIND; BASE; OR FINAL. HE CONTINUED HIS LNDG AND SO DID WE; LNDG IN THE FIRST 500 FT OR SO OF THE RWY; WHILE HE WAS FARTHER DOWN THE END (THE RWY IS 4000 FT LONG). AFTER HIS LNDG; INSTEAD OF USING THE PARALLEL TXWY; HE PROCEEDED TO BACK-TAXI WHILE WE WERE STILL ON THE RWY; WITH NO AVAILABLE TURNOFF BTWN THE TWO OF US. DESPITE OUR EFFORTS TO MOVE AS FAR TO THE R OF THE RWY AS POSSIBLE; HIS L WINGTIP STRUCK OUR L WING; RESULTING IN A SMALL DENT AND SCRATCHED PAINT. SOME WITNESSES ON THE GND RPTED THAT THEY HAD NOT HEARD OUR CALLS; SO WE EXAMINED THE RADIO AND FOUND THAT THERE WAS A CONDITION WHICH MAY HAVE RESULTED IN THE XMISSIONS NOT GETTING THROUGH ALL THE TIME. WE HAD NO WAY OF KNOWING THIS IN THE AIR; BECAUSE WE WERE RECEIVING AND THE RADIO SOUNDED NORMAL WHEN XMITTING.