VFR SMA WITH N90 ENTERED CLASS B BECAUSE OF WX BELOW AND TFC GAINING FROM BEHIND. RPTR BELIEVES ATC SHOULD HAVE PROVIDED AVOIDANCE VECTORS.

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I DEPARTED IN VMC ENRTE TO 47N (CENTRAL NEW JERSEY REGIONAL) TO PICK UP THE OWNER OR THE PLANE. AS SOON AS I WAS IN THE AIR; I CONTACTED NEW YORK APCH TO GET FLT FOLLOWING TO 47N. I WAS TALKING ON 124.07 AND RECEIVED A SQUAWK CODE AND WAS BEING GIVEN ADVISORIES. I WAS THEN SWITCHED TO ANOTHER NEW YORK APCH FREQ. I WAS OVER LONG ISLAND FLYING AT 2900 FT MSL. JUST N OF ISP'S AIRSPACE APCHING THE NEW YORK CLASS B; THE CTLR ADVISED THAT I HAD TFC THAT WOULD BE XING L TO R IN FRONT OF ME -- A HVY JET DSNDING INTO JFK. I HAD THE TFC IN SIGHT. THEN I WAS GIVEN ANOTHER TA AND IT WAS AN MD80 THAT WAS BEHIND ME AND TO MY L DSNDING OUT OF 4000 FT FOR 3000 FT. I HAD THE TFC ON MY TCAS AS WELL AS IN SIGHT. AT THIS POINT; I WAS UNDERNEATH THE OUTER RING FLOOR OF THE CLASS B AIRSPACE. THEN I WAS ADVISED BY THE CTLR THAT I SHOULD NOT STAY AT 3000 FT AS I HAD FASTER TFC BEHIND ME AND AT MY ALT; BUT HE DID NOT CLR ME INTO THE CLASS B AIRSPACE NOR TELL ME TO DSND TO A LOWER ALT. I COULD NOT ALSO DSND BECAUSE THERE WAS A LAYER OF CLOUDS THAT I JUDGED TO BE ABOUT 1000 FT BELOW ME. THEN ON MY TCAS I RECEIVED A TFC ALERT SAYING THAT I HAD TFC THAT WAS 0.5 MI BEHIND ME AT 6 O'CLOCK POS AT MY ALT. THIS WAS THE MD80 WHICH EVERYONE KNEW WAS FASTER THAN I WAS. I COULD NOT DSND BECAUSE I HAD CLOUDS BELOW ME AND I DID NOT KNOW WHAT WAS BELOW ME. I COULD NOT BREAK R AT MY ALT BECAUSE I HAD THE HVY XING L TO R AT MY ALT. MY ONLY OPTION WAS TO BREAK L AND CLB. THIS PUT ME INTO THE CLASS B AIRSPACE WITHOUT BEING CLRED IN; BUT I HAD TO MOVE OR ELSE THE MD80 WAS ON A HEAD-ON COLLISION RIGHT INTO MY REAR. I FELT THAT IF I DID NOT MOVE; THERE WOULD HAVE BEEN A LARGE POTENTIAL FOR A MIDAIR COLLISION. UPON TALKING TO THE CTLR; I CLBED AND CONTINUED ON MY WAY TO 47N CLBING ABOVE THE CLASS B UP TO 8500 FT MSL. I FEEL THIS COULD HAVE BEEN AVOIDED IF I WAS VECTORED AWAY FROM THE NEW YORK JFK'S ARR RTE.