With that cam[0950 I think],5500 maybe on a 348,but that extra .250 stroke on his 380 will lower the peaks by 4-500 rpm.That 66 Imp is fairly heavy so this cam will make it a low rpm tire killer! Hopefully they can start the dyno pulls down in the 2,000-2500 range so we can get an idea of what's available down in the rpm range where it'll be used most often.