My 418/360, production head engine made near 700hp. 1972 360 block with 587 cyl. head castings. 3050+ pound car ran in the 9.60s at 136mph, with 1.26 60ft times, or better cause 60 footed on rears alot of the time. 2700+ passes and no valve job, pistons or crank never out of the block. Very underated engines. Engine in car now is 1972 340 block with 60779 edelbrock heads. Car has ran exactly the same as combo with factory heads. Lost weight with the eddys but had to put the weight back on in the form of wheelie bars.