thanks guys- the general consensus from all I spoke with, sent dyno results / car set up, estimated weight/tire etc was- 4800 / diode/billet/ anti ballooning /furnace brazed etc, etc.
In other words- a good/modern 4800 stall converter.
will re- stall if need be after testing the car.

car is back from frae shop- glad I took it.
Looked/measured good here but- frame machine /operator found her twisted a little across the front which explained door gaps being slightly off side to side.
All squared/plumbed up in all planes and so- on with the build breathing easy.

One again- My thanks to all.