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Go with a Comp Cams 270 or 280 Magnum.The 270 will be a little more streetable, and still hit a good little lick.The 270 will not cause any problems with the stock convertor, and the vacuum for the brakes, the 280 might create a few problems. Both cams will give you the idle you are looking for.

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1972 Malibu (1 st. car) Project waiting to happen
Team Chevelle # 427
A.C.E.S. # 1282
 

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Yeah, everyone wants the thump , but in your case ,without compression, and other factors, it's going to run terrible.The 270 Comp is the biggest you can run with stock convertor in their line.I would suggest a smaller cam , but you aren't going to get the sound you want.

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1972 Malibu (1 st. car) Project waiting to happen
Team Chevelle # 427
A.C.E.S. # 1282
 

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Both, to give you a short answer.A shorter lobe (110 and down) seperation will result in a rougher idle , when compared to the same cam with higher(112 up)lobe seperation. But most of the cams listed have around 110-112 LS.In order to change it, you will have to get a custom grind(read expensive).

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1972 Malibu (1 st. car) Project waiting to happen
Team Chevelle # 427
A.C.E.S. # 1282
 
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