Which transmission should i use?

depending on which way you go....why not install a complete mopar automatic console & shifter from a 4/5/6 Barracuda ? it would essentially appear stock, can be used with a reverse valve body or regular valve body. if properly installed can be used with either 904 or 727 and does not look like a giant toaster? and they are all over the place with shiofters for around 200....... there are also custom transmission that you can buy for thousands and thousands...... but why? unless you plan on putting in a 4:88 gear and runnin it at the strip and plan on driving it the 100 miles to the strip why go into all that? for the gas mileage? or performance? for everyday use, cruising and the occasional shot a well built 904 should do ya just fine....if ya need more try the 727....if ya need more seek a custom build...but make certain you have a ski mask so you can hold up a few Party stores to get the insane money to have it made LOL