you could try

Pull all of the plugs, hook up a remote starter and pick a cylinder. You can do one cylinder at a time. You can do it according to the firing order.
Or you can do it totally random. I use a bright yellow marker and put a dot on the rocker after it is adjusted.

Adjust the intake valve when the exhaust valve opens

Adjust the exhaust valve when the intake closes

even a cave man could do it

1947 M15 Studebaker 454 4x4
1949 Chevy COE
In the Stovebolt Gallery
More pix of the COE
1950 Harley FL
1958 GMC LCF 455 3x2bbl
1961 Chevy C60 Tilt Cab 327
1966 Chevy C60 Tilt Cab 496
1961 Chevy K10 sb 292
1974 Harley FXE
1979 Chevy K10 sb
2007 Harley Streetglide


I'm not that good but I'm slow