My gut level feeling is that there are some mismatched pieces in the combo. Cam is smallish but if you go up in size to the XE268 or equivalent you will need to do more work on the heads, at least in the case of the XE268 which will require machining of the spring seats to use the 995 springs. You could probably find another cam and spring combo to avoid this extra work to the heads. Then there is the issue of adjustable valve train; you didn't say, so I am assuming that yours is not adjustable which in turn limits your cam choices. Also, if affordable, more gear and converter would help but may not be desirable if primary use is street not track. Everything is a tradeoff.
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69 Bird w/1970 400 block(409 cubes), #64 heads, hyd. roller, Q-jet by Jeff E., original interior, ps, pdb, th350, and 3.73 gears. Pump gas, street driven muscle. 3800 lbs. race weight. Best, 11.39 @118, my son's car.
79 T/A w/463, Scat crank, Eagle rods, Icon pistons, Lunati solid roller, 262/270, KRE 325 heads, Northwind intake, QF950 carb, full interior, ps, pdb, th350, and 3.73 gears. Pump gas, 3650 lbs. race weight. 10.60 @ 126 so far...
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