Most of the moderate ford style cams back in the FE days took .025-.027 valve lash-------set before engine start up and again after warm up and head re torqueing.

Set initial timing to around 12*btdc and total at 36-38 depending on the gas octane-I liked to lock out the advance curve, find where it would start and idle nice-then advance it to point where it performed max-then build curve to accommodate those numbers with the fastest curve with springs that would drag it back on shutdown which then will not buck the starter. Also-on Ford stuff--its venture vacume that the ignition system uses--------