Who has done a 5.7 with a833 4 speed Overdrive ?

I guess it depends on what you want. The Holley mounts allow for an oil filter adapter so a remote filter kit isn’t needed, OEM mount AC compressor and (most importantly??) the 6.4 intake fits without a notch on the firewall.

I am doing a T56 so I have to build a new crossmember anyways so it isn’t a big deal for me.

Far as I know, no one has done a 4 speed swap with the Holley mounts. My best guess is, a custom shifter mount and rods with a hydraulic clutch kit would make it work.

If you don’t want AC nor the SRV option of a 6.4 car intake, maybe stick with the TTI mounts. Should bolt in and allow the use of all stock 4 speed stuff. Still have to mess with the oil filter, but it’s not new territory like the 4 speed shifter with the Holley mounts is. Schumaker has mounts as well. Only real trick is matching your current k-frame to which ever manufacturer makes mounts that fit it. US Car Tool has mounts as well.