Here is a reasonable-priced cam that will do the job, and about the biggest I would run in the stock 307.
http://www.summitracing.com/parts/cc...make/chevrolet
It will give a little chop at idle and help keep the low end grunt. I prefer the bigger split to help out the weak exhaust runner flow.
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1972 SS 454 Chevelle LS5/M21/12 bolt 3.73 posi
1969 Malibu COPO L72/M20/12 bolt 3.31 posi
1968 Malibu LQ9/4L80E/12 bolt 3.73 posi
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