the XE268 is pretty tame in a 383......very mild lope, & power just up off idle. I shift mine @ 5800-6000 under full throttle. that same cam in a 350 will be a little more "rowdy", & will like about 2500 on the stall with an auto trans. If you have 3.73-4.10 gears,& a loose converter the cam will work good in a 350....i do agree that low end power will suffer a bit tho(as well as milage). Depening on gearing,& useage I would look at the XE256, or Xe262 for a 355. Good luck,crazyL 
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....
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