Well shit if you dont car how lumpy it is the 224 is a very hard to beat all around cam. And if there is a GP going on...

Actually...check out this graph. It has all the comp XE and XE-R lobes available. I would say stay at or less than 224 for what your looking for. The smaller you go the better the idle, but the old ways of the SBC as far as losing low end TQ in trade for high rpm HP really doesnt apply untill you start getting into the really big cams. So get the biggest one that will suffice for your desired idle. Id say between a 220 through a 224 single pattern 114 LSA with 4 degrees advance ground in. Single patterns seem to require less tuning. A 224/224 is a single pattern VS a 220/224 traditional split pattern or something like a 230/224 reverse split.