Hrmm... maybe you have a vacuum leak somewhere. Still, that's a big cam for a cruiser. JMHO
My 2000 Z28 that ran high 10's - full weight, drag radials, through mufflers... did so with a 228/236 @ .050" duration cam in a 347" LS1. It had great manners and pulled 17-18 inch/hg of vacuum. (factory cam was 20-21 inch/hg for comparison) It was a Crane cam, I had a Comp Cam in it previously that made less vacuum (12-13 inch/hg), made less power, and had lots of cam surge unless I kept the RPM up. That cam was 238/242 @ .050"
I could go on about cam stuff, but I feel we need to figure out your vacuum problems for now.
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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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