In order to stay close to 8:1 dcr, I need a hydraulic cam with an intake closing of 69 or 70. What ICL could I run with a solid lift when lash is figured in? The cam I wanted to run gives me 8.66 without lash figured in.

I'm not sure I understand your question. However, here is the info on lash and duration.

It depends on the amount of lash and the rocker ratio compared to what lift the mfg took the duration at. The correct tappet lift point is lash/ratio+.004". For example, using .026" lash and 1.5: rocker, the correct tappet lift to measuring the duration at is .02133". Most cam companies would take the duration at .020". In fact, in this case, the valve is still on the seat at .020" and the cam is actually smaller than speced. It could be quite a bit smaller or not much smaller depending on the design of the cam. Measuring with a degree wheel is the only way I know of to determine the actual duration of the cam at .02133" tappet lift. If the lash is less than .024", given 1.5 rockers, the cam is bigger than speced (with .024" lift and 1.5 rockers, .020" is the correct tappet lift). Hope this makes sense.

Another way to decrease DCR is to run the cam with less advance. I wouldn't recommend less than "0" advance (straight up). If you can get 8.3 using less than the usually 4-6º advance you should be OK.

The cam I would like to run is th UD 276/284 f10 solid. Plug it into Desktop Dyno, you get a seat to seat intake closing of 62 degrees. My set up and the 104 ICL give me a dcr of 8.66. The hydraulic that I have now has a 73 degree intake closing and 7.91 dcr. This what makes me think I need at least a 69 degree intake closing.

What DCR did you get with 69º.

I get 8.19:1 with 69. If I understand correctly, this would be the earliest closing I could run.

You can run up to 8.25-8.3 without expecting problems (8.5 with a few caveats). What engine is this, post the specs. I'm just guessing now.

355
Sportsman II's 64cc
Felpro compression gasket( used gasket mic's .039 )
Stock deck ( guessing .025)
TRW LT1 .100 dome piston 2.4cc dome
5.7 rod
Lunati BMII 292/.480 109/107
This engine runs fine on 93 at 38 degrees total timing. I have never tried more timing.

The current UD cams are ground with 4 deg advance. Actually the pin is moved. So if you install the 276/284 retarded 4 degrees, it will actually be straight up. Just use a TC w/ 3 keyways. Or get bushings for your current set. That way,the 276 cam will end up with an IC of 68-69.
I had to do this to get my 276/284 to clear all the rods in my 383. FYI, you'll probably have about 10"-11" of idle vacuum @900rpm with this cam.

You could also order the cam with a 112LSA to clean up the idle a little and move the IC. You'd need to verify w/ Harold how to move the LSA. They might not move each lobe the same amount.