"I agree about the 4 spd stuff. costs for a BB 4 spd, and everything, and a SB 4 spd and everything are almost the same. A couple hundred more for the BB because odds of finding used BB clutch lonkage for an A body would be rare, so you will have to buy it new."
That's why I never even looked for that stuff. A little cut here, weld there and you've made it yourself. As a matter of fact, both of my sons' big block four speed a-bodies have relocated z-bars (the exhaust fits better this way). There was no factory setup for the big bell housing anyway. wouldn't one have come in a 440 4 spd 69 cuda?
This is hot rodding. Making parts, modifying parts, etc. In some ways things are way too easy these days. Just hop on the internet, order a bunch of parts with instructions, and throw the car together.