Mike;
I'm in the process of building a '34 gas roadster. Some of the things I'm doing might be a little more time consuming during the fabrication of the car, but I think in the long run that extra effort is worth it and may make life easier down the road. My fire wall, .250 6061-T6 aluminum, will bolt into frame. Engine can either go in/out from the front with the fire wall in frame, or, engine, fire wall, bell housing and tranny can go in/out as a unit.
Good luck on your build. I can email some pictures if you like.
John