I have always started (about 4 times now) with the rearend installed, then put together the front suspension. Next, I physically lift up the front of the chassis at the frame horns and pull the chassis over to where the front suspension is. I have a jack stand there to rest the one or both frame rails on. I then use a couple 2x4's stacked up under the steering arm to get the front end at approximately the right angle and then lower the chassis onto the suspension. I know a Model A chassis is pretty light, but I'm sure you could handle your chassis.
If you have the everything installed already (i.e. eng/trans) I would use jackstands and a floor jack. Use the jack under the frame horn to lift the chassis off the jackstands, then lower onto the front suspension. One should work fine. I have done that too. Just go slow.

Keith