Most of the parts w/ disconnected hoses or connectors you show are part of the EGR system. It was a klutsy system, so may not even work right if you reconnect. I removed all those parts, including the EGR valve (used Rollguy's ~$15 block-off plates). You can find a schematic here that shows what parts are EGR, over half of the vacuum stuff.

What you do need is the "blue saucer" hooked up correctly (1st photo). The "TRA" port goes to your transmission modulator (driver's side, near shifter input). The blue saucer is a "buffer amplifier" that makes the shifting better. Indeed, I put one in my 1984 300D. It also gets input from intake manifold pressure (via "switch-over" switch on firewall), which I recall delays shifting under higher boost. All improvements. The main transmission signal is from the VCV mounted on top of the IP. It leaks vacuum to atm (black tube w/ filter open on cabin side), as the "throttle" is rotated, intent being to simulate intake manifold pressure in a gas engine. You can read detailed writeups in a search.

Your 1985 CA is different in several ways from earlier engines. Your tach signal comes off the transmission bell-housing (ignore "diagnostic" pickup on front of engine) and goes thru the EGR control box (so don't rip it out), as I recall does your AC clutch drive. Your IP has a "rack position sensor" that goes there too (also 1984). Your intake, exhaust, & turbo are different, w/ corresponding changes to starter and alternator (heat shields, clocking). If the original "trap oxidizer" wasn't replaced, I read you can still get the cat converter type replacement free from a dealer. Do so, or it can ruin the engine (reason for recall). Best to keep your frame-mounted air cleaner. Indeed, I put one in my 1984. I used silicone "turbo" 90 deg duct and cut the cleaner outlet shorter. The correct air filter is ~$45, but you can stack two $5 Wix filters instead. I posted the PN (for Toyota MR2 1978? or whatever I said).

Can't tell you about performance mod's, but there is a forum for that. Your transmission is also different (.4xx instead of .3xx earlier). It has slightly taller final gears (or maybe that is in the rear-end), which is the right direction for me but not for hot rodders.

__________________
1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans