Aftermarket forged 360 crank, some light-weight parts, more compression, more racier ring pack, bigger roller cam, more attention and time spent on a Victor340, bigger carb, more rpm, and I know I could do a better set of Edelbrock heads than he ran. The throat isn’t even sized right on those heads as I couldn’t do back then what I can do now. Those heads still have a three anger valve job. With his combo that ran 6.54 what would a good 904 or powerglide be worth over his 727. I Dont use deck plates or vacuum pumps so I’m sure there’s a little horsepower there too.