The year you get doesnt greatly affect the amount of power that it had in the stock form. Check out these dyno results http://www.cad500parts.com/catalog/page7.htm The 76 engine (which is what mine is) We will start with our low compression buildup, and move on to the high compression engine later on. Our low compression short block was based on a ’76 spec rebuild, and was built with 8:1 instead of 8.5:1 compression due to piston modification for later race combos not detailed here. The short block was bored 0.060" over, with 0.002" piston clearance, reconditioned stock rods with ARP fasteners on an OE crank turned .010/.010 (not balanced), and assembled following stock clearance specs using the following parts: Standard off the shelf cast ‘74-’76 replacement pistons (Pg 11) True Roller timing set (Pg 12) OE HEI distributor Moly rings (Pg 10) OE camshaft, new lifters 120cc heads (‘74-’76) #493 Clevite rod and main bearings (Pg 10) reconditioned OE pushrods Straight 45° valve job (OE valves) Durabond cam bearings (Pg 10) Our light duty street springs (Pg 12) OE 76 manifolds and carb And the dyno says: 493.5 Lb-Ft at 2600 RPM and 302.1 HP at 3600. now the 1970 engine The base engine for test mule #2, essentially built to ‘70 Eldorado specs, at 10:1 compression, similar assembly to the 8:1 test mule. The short block features Cad Company's direct replacement forged rods with ARP fasteners, and a balanced rotating assembly due to higher RPM testing to be done later, and was built using: cast 10:1 replacement pistons (Pg 11) True Roller timing set (Pg 12) OE HEI distributor Moly rings (Pg 10) OE camshaft, new lifters 76cc heads (‘68-’73) #250/902 Clevite rod and main bearings (Pg 10) reconditioned OE pushrods Straight 45° valve job (OE valves) Durabond cam bearings (Pg 10) Our light duty street springs (Pg 12) OE 70 manifolds and OE carb (Pg 22) Bone stock it pulled 323 HP and 504 Ft-Lb of torque, about the same as the stock 8:1 with the CTA 120 cam, thoroughly dispelling the myth of the 200+ HP difference between the ‘70 Eldo engine and the later smogger engines. This info is just to kill any myths about the different power levels. They were rated differently from 70 to 76, so thats why the manufacturer's power numbers appear so different.