The original Camshaft that I picked was from www.competitionproducts.com It is a Cam kit . This Cam is a better cam then the Energizer 274H for your build . The Cam I first talked about is a dual-pattern cam That will give you more Torque then that single-pattern Energizer . That first Camshaft was a 214/224 dur at 050 with 444/465 lift and a 112 L/C . The Complete Cam Kit is a part # E922K . This kit comes with Cam and lifters / A set of Z-28 valve springs / heat-treated steel valve locks / high grade Umbrella valve seals / And assembiy lube . The cost of this kit is $129.95 . That's a good deal and I have used this cam set in a 350 like yours . And it raged on the street in a 1978 Z-28 with a stock converter and a 342 gear . Also that Crane 272H cam is 218dur at 050 the Comp cams 268H is 216dur at 050 Both are 454 lift near the same but not the same . The single -pattern that is one up on both of them is . The Speed-pro CS1169R it's 218dur at 050 with 458 lift and a 110 C/L and cost $54.13 . Go with the Dual-pattern cam you will make more HP and Torque it is the better street cam . COOL