I would go with the bigger cam, I havent looked at the specs but I bet the two cams have identical ramps, also with the 9.8 compression the slightly larger one will work better. as far as carbs if they are both annular booster versions go the 575 cfm.
I dont have desktop dyno but I could guesstimate about 250fwhp from that combo.
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67 vert, 408 stroker 205cc TW heads, CI cust hyd roller,Dougs 1 3/4 try y's, global west neg roll,lentech aod...etc etc etc
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