a 3-figure income would be max $999 a year...

As opposed to the regular compression-wasting thick 0.039" FelPro headgaskets, one can use steel 0.020" headgaskets to increase the CR a bit.

Also, before you go ordering a 'new' transmission, there used to be a time when 'TCI' was better known for Total Crap Inside...

IMO, a normal/stock 727 will be beafy enough for your use.