Mike if your heads have been decked, your intake and distributor will sit the same amount farther down on and in the block. So I would guess that would account for the preload on your dist. Shimming it up the same amount the block was decked should fix the problem. No guarantee from me though.

MAN AM I RUDE... I WANT TO INTRODUCE MYSELF..IAM TOM FROM TEXAS[PINK ROD]... IAM A RETIRED NAVY GUY[25 YRS SPINNING WENCHES AND DOING WHAT I WAS TOLD FOR A GOOD CAUSE] WHO HAS BEEN A GEARHEAD SINCE HIGH SCHOOL AUTO SHOP.I HAVE BEEN IN THE GAS BUSINESS[UNION 76] AND HAVE HAD FUN RACING; NHRA,APBA [BOATS], AND SCCA. I DONT CARE WHAT YOU DRIVE,GM, MOPAR, FORD, ETC., THEIR LIKE WOMEN,I LOVE THEM ALL....BUT I CAN ONLY LOVE THE ONE I'AM WITH ....1953 LT1 6 SPEED STUDEBAKER. I HAVE HAD ALL THE FAMOUS CARS..INCLUDING CORVAIR YENKO STINGER THAT WOULD DO 140 ON STRAIGHTAWAY. I THINK MY FAVORITE WAS MY INJECTED 340 65 CUDA BRACKET CAR.
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pink rod ... tom