What to set valve lash w/o cam card?

Wyrmrider said

1975 was b 4 tight lash cams most likely
what's the lash now? should give you a clue
using rusty's method you will not hurt anything
staring of at 30 30 or .028 you could
what''s your compression?
engine been rebuilt? (1970 pistons)
recent timing chain?
70 is a good motor

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Just getting ready to pull the old aluminum Mr. Gasket covers off (hopefully later today), so I'll find out then.
Have not checked the compression. I have all the engine wiring out, so it will be awhile before I can check each cylinder's compression. Factory compression ratio is 10.5 :1 for the '70 duster 340.
Engine never rebuilt, just the above changes I mentioned (that I know of from speaking to all three previous owners). The front cover does have a small trace of silicone oozed out, so "maybe" on a new timing chain. (?) It has 79k actual miles on the car with all #s matching.
This thing runs strong for being close to original.