I know I am late to the party but a long block 400F110 is 1200$
and the high torque version of this engine Long block is 1600$
I looked at it with the 72 year and the 400 cubic inch displacement you provided. I don't make it over to the GA chapter very often and the month of Sept for me was spent working on my 7.3L for many hours when I was not at work.